MICHEL L. LAPIDUS
http://math.ucr.edu/~lapidus

July 2010
List of Publications

Published Research Journal Articles:[JA1]“Formules de Moyenne et de Produit pour les Résolvantes Imaginaires d'Opérateurs
Auto-Adjoints”, [Mean and Product Formulas for Imaginary Resolvents of Self-Adjoint
Operators], Comptes Rendus de l’Académie des Sciences Paris Sér. A 291 (1980), pp.
451-454; MR 81j:47016; Zbl 446:47010.

[JA2]“Généralisation de la Formule de Trotter-Lie”, [Generalization of the Trotter-Lie
Formula], Comptes Rendus de l’Académie des Sciences Paris Sér. A 291 (1980), pp.
479-500; MR 81k:47092; Zbl 447:47023.

[JA3]“Perturbation d'un Semi-groupe par un Groupe Unitaire”, [Perturbation of a Semigroupby a Unitary Group], Comptes Rendus de l’Académie des Sciences Paris Sér. A 291(1980), pp. 535-538; MR 82d:47046; Zbl 447:47022.

[JA4]“Generalization of the Trotter-Lie Formula”, Integral Equations and Operator Theory 4(1981), pp. 366-415; MR 83e:47057; Zbl 463:47824.

[JA5]“Modification de l'Intégrale de Feynman pour un Potentiel Positif Singulier: Approche
Séquentielle”, [Modification of the Feynman Integral for a Nonnegative Singular
Potential: Sequential Approach], Comptes Rendus de l’Académie des Sciences Paris
Sér. I Math. 295 (1982), pp. 1-3; MR 83b:81028; Zbl 493:35038.

[JA6]“Intégrale de Feynman Modifiée et Formule du Produit pour un Potentiel Singulier
Négatif”, [Modified Feynman Integral and Product Formula for a Negative Singular
Potential], Comptes Rendus de l’Académie des Sciences Paris Sér. I Math. 295 (1982),
pp. 719-722; MR 85h:35065; Zbl 508:35027.

[JA7]“Valeurs Propres du Laplacien avec un Poids qui Change de Signe”, [Eigenvalues of
the Laplacian with an Indefinite Weight Function], Comptes Rendus de l’Académie desSciences Paris Sér. I Math. 298 (1984), pp. 265-268; MR 85j:35139.

[JA8]“Eigenvalues of Elliptic Boundary Value Problems with an Indefinite Weight Function”,
Transactions of the American Mathematical Society 295 (1986), pp. 305-324; MR
87j:35282, (with J. Fleckinger).

[JA9]“Product Formula for Imaginary Resolvents with Application to a Modified Feynman-1-Integral”, Journal of Functional Analysis 63 (1985), pp. 261-275; MR 87c:47059.
[JA10]“Perturbation Theory and a Dominated Convergence Theorem for Feynman Integrals”,
Integral Equations and Operator Theory 8 (1985), pp. 36-62; MR 86g:81036.

[JA11]“The Differential Equation for the Feynman-Kac Formula with a Lebesgue-Stieltjes
Measure”, Letters in Mathematical Physics 11 (1986), pp. 1-31; MR 87d:58033.

[JA12]“Generalized Dyson Series, Generalized Feynman Diagrams, the Feynman Integral andFeynman's Operational Calculus”, Memoirs of the American Mathematical Society No.
351, 62 (1986), pp. 1-78, (with G.W. Johnson); MR 88f:81034.

[JA13]“The Feynman-Kac Formula with a Lebesgue-Stieltjes Measure and Feynman's
Operational Calculus”, Studies in Applied Mathematics 76 (1987), pp. 93-132.

[JA14]“Remainder Estimates for the Asymptotics of Elliptic Eigenvalue Problems with
Indefinite Weights”, Archives for Rational Mechanics and Analysis 98 (1987), pp. 329356, (with J. Fleckinger); MR 88b:35149.

[JA15]“The Feynman-Kac Formula with a Lebesgue-Stieltjes Measure: An Integral Equationin the General Case”, Integral Equations and Operator Theory 12 (1989), pp. 163-210.

[JA16]“Une Multiplication Non Commutative des Fonctionnelles de Wiener et le Calcul
Opérationnel de Feynman”, [A Noncommutative Multiplication of Wiener Functionals
and Feynman's Operational Calculus], Comptes Rendus de l’Académie des Sciences
Paris Sér. I Math. 304 (1987), pp. 523-526, (with G.W. Johnson).

[JA17]“Strong Product Integration of Measures and the Feynman-Kac Formula with aLebesgue-Stieltjes Measure”, Supplemento ai Rendiconti del Circolo Matematico diPalermo, Ser. II, 17 (1987), pp. 271-312.

[JA18] “Tambour Fractal: Vers une Résolution de la Conjecture de Weyl-Berry pour lesValeurs Propres du Laplacien”, [Fractal Drum: Towards a Resolution of the
Weyl-Berry Conjecture for the Eigenvalues of the Laplacian], Comptes Rendus del’Académie des Sciences Paris Sér. I Math. 306 (1988), pp. 171-175, (with thecollaboration of J. Fleckinger).
[JA19]“Noncommutative Operations on Wiener Functionals and Feynman's Operational
Calculus”, Journal of Functional Analysis 81 (1988), pp. 74-99, (with G.W. Johnson).

[JA20]“Schrödinger Operators with Indefinite Weights: Asymptotics of Eigenvalues with
Remainder Estimates”, Differential and Integral Equations 7 (1994), pp. 1389-1418,(with J. Fleckinger).

[JA21]“Fractal Drum, Inverse Spectral Problems for Elliptic Operators and a Partial-2-Resolution of the Weyl-Berry Conjecture”, Transactions of the American MathematicalSociety 325 (1991), pp. 465-529.
[JA22]“Quantification, Calcul de Feynman Axiomatique et Intégrale Fonctionnelle
Généralisée”, [Quantization, Axiomatic Feynman's Operational Calculus andGeneralized Functional Integral], Comptes Rendus de l’Académie des Sciences Paris
Sér. I Math. 308 (1989), pp. 133-138.

[JA23]“Product Formula for Normal Operators and the Modified Feynman Integral”,
Proceedings of the American Mathematical Society 110 (1990), pp. 449-460, (with
A. Bivar Weinholtz).

[JA24]“La Fonction Zêta de Riemann et la Conjecture de Weyl-Berry pour les Tambours
Fractals”, [The Riemann Zeta-Function and the Weyl-Berry Conjecture for Fractal
Drums], Comptes Rendus de l'Académie des Sciences Paris Sér. I Math. 310 (1990),
pp. 343-348, (with C. Pomerance).

[JA25]“Hypothèse de Riemann, Cordes Fractales Vibrantes et Conjecture de Weyl-Berry
Modifiée”, [The Riemann Hypothesis, Vibrating Fractal Strings and the Modified
Weyl-Berry Conjecture], Comptes Rendus de l'Académie des Sciences Paris Sér. I Math.
313 (1991), pp. 19-24, (with H. Maier).

[JA26]“The Riemann Zeta-Function and the One-Dimensional Weyl-Berry Conjecture for
Fractal Drums”, Proceedings of the London Mathematical Society (3) 66, No. 1 (1993),
pp. 41-69, (with C. Pomerance).

[JA27]“The Riemann Hypothesis and Inverse Spectral Problem for Fractal Strings”, Journal of
the London Mathematical Society (2) 52, No. 1 (1995), pp. 15-35, (with H. Maier).

[JA28]“Weyl's Problem for the Spectral Distribution of Laplacians on P.C.F. Self-Similar
Fractals”, Communications in Mathematical Physics 158 (1993), pp. 93-125, (with J.
Kigami).

[JA29]“Indefinite Elliptic Boundary Value Problems on Irregular Domains”, Proceedings of
the American Mathematical Society 125 (1995), pp. 513-526, (with J. Fleckinger).

[JA30]“Analysis on Fractals, Laplacians on Self-Similar Sets, Noncommutative Geometry andSpectral Dimensions", Topological Methods in Nonlinear Analysis, No. 1, 4 (1994), pp.
137-195.

[JA31]“Eigenfunctions of the Koch Snowflake Drum”, Communications in Mathematical
Physics 172 (1995), pp. 359-376, (with M. Pang).

[JA32]“Fractals and Vibrations: Can You Hear the Shape of a Fractal Drum?”, Fractals No.
3, 3 (1995), pp. 725-736.
-3-

[JA33]“Counterexamples to the Modified Weyl-Berry Conjecture”, Mathematical
Proceedings of the Cambridge Philosophical Society, 119 (1996), pp. 167-178, (with C.
Pomerance).

[JA34]“Generalized Minkowski Content and the Vibrations of Fractal Drums and Strings”,
Mathematical Research Letters 3 (1996), pp. 31-40, (with C. Q. He).

[JA35]“Generalized Minkowski Content, Spectrum of Fractal Drums, Fractal Strings and the
Riemann Zeta-Function”, Memoirs of the American Mathematical Society No. 608, 127(1997), pp. 1-97, (with C. Q. He).

[JA36]“Snowflake Harmonics and Computer Graphics: Numerical Computation of Spectra on
Fractal Domains”, International Journal of Bifurcation and Chaos 6 (1996), pp. 11851210, (with J. W. Neuberger, R. J. Renka, and C. A. Griffith). (Includes 23 computer
graphics color plates.)[JA37]“Feynman's Operational Calculus and Evolution Equations”, Acta Applicandae
Mathematicae 47 (1997), pp. 155-211, (with B. DeFacio and G. W. Johnson).

[JA38]“Feynman's Operational Calculus: A Heuristic and Mathematical Introduction”,
Annales Mathématiques Blaise Pascal 3 (1996), pp. 89-102. (Special issue dedicated tothe memory of Prof. Albert Badrikian.)[JA39]“Self-Similarity of Volume Measures for Laplacians on P.C.F. Self-Similar Fractals”,
Communications in Mathematical Physics 217 (2001), pp. 165-180, (with J. Kigami).

[JA40]“Complex Dimensions of Self-Similar Fractal Strings and Diophantine
Approximation”, Journal of Experimental Mathematics No.1, 12 (2003), pp. 41-69,(with M. van Frankenhuysen).

[JA41]“Fractality, Self-Similarity and Complex Dimensions”, Proceedings of Symposia in
Pure Mathematics, American Mathematical Society, 72 (2004), Part 1, pp. 349-372,(with M. van Frankenhuijsen). [E-print: arXiv:math.NT/0401156, 2004.][JA42]“Random Fractal Strings: Their Zeta Functions, Complex Dimensions and Spectral
Asymptotics”, Transactions of the American Mathematical Society No.1, 358 (2006),
pp. 285-314, (with B. Hambly).

[JA43]“A Tube Formula for the Koch Snowflake Curve, with Applications to Complex
Dimensions”, Journal of the London Mathematical Society No. 2, 74 (2006), pp. 397414, (with E. P. J. Pearse). [E-print: arXiv:math-ph/0412029, 2005.][JA44] “Beurling Zeta Functions, Generalized Primes, and Fractal Membranes”, Acta
Applicandae Mathematicae No.1, 94 (2006), pp. 21-48, (with T. Hilberdink). [E-print:-4-

arXiv:math.NT/0410270, 2004.][JA45] “Feynman's Operational Calculi: Auxiliary Operations and Related Disentangling
Formulas”, Integration: Mathematical Theory and Applications No. 1, 1 (2008), pp. 2948, (with G. W. Johnson).
[JA46]“Localization on Snowflake Domains”, Fractals No. 3, 15 (2007), pp. 255-272, (with
B. Daudert). [E-print: arXiv:math.NA/0609798, 2006.][JA47]“Nonarchimedean Cantor Set and String”, Journal of Fixed Point Theory andApplications 3 (2008), pp. 181-190, (with H. Lu). (Special issue dedicated to Vladimir
Arnold on the occasion of his Jubilee. Vol. I.) [E-print: IHES/M/08/29, 2008. re.pdf.][JA48]“A Trace on Fractal Graphs and the Ihara Zeta Function”, Transactions of the American
Mathematical Society No. 6, 361 (2009), pp. 3041-3070, (with D. Guido and T. Isola).
[E-print: arXiv:math.OA/0608060v3, 2008. IHES/M/08/36, 2008.][JA49] “Ihara’s Zeta Function for Periodic Graphs and Its Approximation in the Amenable
Case, Journal of Functional Analysis, No. 6, 255 (2008), pp. 1339-1361, (with D.
Guido and T. Isola). [E-print: math.OA/0608229. IHES/M/08/37, 2008. re.pdf.][JA50] “Dirac Operators and Spectral Triples for some Fractal Sets Built on Curves”, Advancesin Mathematics No. 1, 217 (2008), pp. 42-78, (with E. Christensen and C. Ivan). [Eprint: arXiv:math.MG/0610222v2, 2008.][JA51] “Fractal Strings and Multifractal Zeta Functions”, Letters in Mathematical Physics No.
1, 88 (2009), pp. 101-129, (with J. Levy Vehel and J. A. Rock). (Special issue dedicatedto the memory of Moshe Flato.) (Springer Open Access: DOI 10.1007/s11005-0090302-y.) [E-print: arXiv:math-ph/0610015v3, 2009.][JA52] “Towards Zeta Functions and Complex Dimensions of Multifractals”, Journal ofComplex Variables and Elliptic Equations No. 6, 54 (2009), 545-559, (with J. A.
Rock). (Special issue dedicated to Fractal Analysis.) [E-print:
arXiv.math.ph/0810.0789, 2008. IHES/M/08/34, 2008.][JA53] “Self-Similar p-Adic Fractal Strings and Their Complex Dimensions”, p-Adic Numbers,
Ultrametric Analysis and Applications. (Russian Academy of Sciences, Moscow, andSpringer-Verlag), No. 2, 1 (2009), pp. 167-180, (with H. Lu). [E-print: IHES/M/08/42,
2008.][JA54] “Tube Formulas and Complex Dimensions of Self-Similar Tilings”, Acta Applicandae
Mathematicae No. 1, 112 (2010), 91-137 (with E. P. J. Pearse). (Springer Open Access:
DOI 10.1007/S10440-010-9562-x) [E-print: arXiv:math.DS/0605527v6, 2010.
IHES/M/08/27, 2008.]-5-

In Press Research Journal Articles:
Submitted Research Journal Articles:[JA55] “Pointwise Tube Formulas for Fractal Sprays and Self-Similar Tilings with Arbitrary
Generators”, 45 typed pages, 2010, (with Erin P. J. Pearse and Steffen Winter). [E-print:
arXiv:math.DG:1006.3807v1][JA56] “Partition Zeta Functions, Multifractal Spectra, and Tapestries of Complex Dimensions”,
48 types pages, 2010, (with Kate E. Ellis, Michael Mackenzie and John Rock). [E-print:
arXiv:math.PH/1007.1467v1, 2010.]
Published Conference Proceedings:[CP1]“Spectral Theory of Elliptic Problems with Indefinite Weights”, in Proc. May-June 1984
Workshop “Spectral Theory of Sturm-Liouville Differential Operators”, Hans G. Kaperand A. Zettl (Eds.), ANL-84-73, Argonne National Laboratory, Argonne, 1984, pp. 159168.

[CP2]“Product Formula for Imaginary Resolvents, Modified Feynman Integral and a General
Dominated Convergence Theorem”, Semesterbereich Funcktionalanalysis
Sommersemester 84, Mathematisches Institut Eberhard-Karls-Universität Tubingen, R.
Nagel, H. Shaefer and U. Schlotterbeck (Eds.), 1984, pp. 9-24.

[CP3]“Asymptotic Distribution of the Eigenvalues of Elliptic Boundary Value Problems and
Schrödinger Operators with Indefinite Weights”, 14 pages, in “Partial Differential
Equations”, Proc. VIIIth Latin American School of Mathematics, held in July 1986 at
IMPA, Rio de Janeiro, Brazil.

[CP4]“Product Formula, Imaginary Resolvents and Modified Feynman Integral”, Proceedings ofSymposia in Pure Mathematics, American Mathematical Society 45 (1986), pp. 109-112;
MR 87j:47059.

[CP5]“Feynman's Operational Calculus, Generalized Dyson Series and the Feynman Integral”,
Contemporary Mathematics, American Mathematical Society 62 (1987), pp. 437-445,(with G.W. Johnson); MR 88c:81025.

[CP6]“The Feynman Integral, The Feynman-Kac Formula with a Lebesgue-Stieltjes Measureand Feynman's Operational Calculus”, in “Path Summation: Achievement and Goals”,
S.O. Lundquist et al. (Eds.), World Scientific, Singapore, 1988, pp. 327-335.

[CP7]“Can One Hear the Shape of a Fractal Drum? Partial Resolution of the Weyl-Berry
Conjecture", in "Geometric Analysis and Computer Graphics”, Proc. Workshop on"Differential Geometry, Calculus of Variations and Computer Graphics", held at theMSRI, Berkeley, in May 1988, P. Concus, et al. (Eds.), Mathematical Sciences Research-6-Institute Publications, Vol. 17, Springer-Verlag, New York, 1991, pp. 119-126.
[CP8]“Inverse Spectral Problems for Elliptic Operators on Fractal Drums and the Weyl-Berry
Conjecture”, in “Differential Equations and Applications”, Vol. II (Columbus, OH, 1988),
Ohio Univ. Press, Athens, 1990, pp. 101-102.

[CP9]“Feynman's Operational Calculus as a Generalized Path Integral”, in "Stochastic
Processes. A Festrischift in Honour of Gopinath Kallianpur", S. Cambanis, et al. (Eds.),
1992, Springer-Verlag, New York, pp. 51-60, (with B. DeFacio and G.W. Johnson).

[CP10]“The Vibrations of Fractal Drums and Waves in Fractal Media”, in “Fractals in the
Natural and Applied Sciences” (A-41), Proc. 2nd IFIP International Conference "Fractals
93", held in London (England, UK) in September 1993, M.M. Novak (Ed.), Elsevier
Science B.V., North Holland, 1994, pp. 255-260.

[CP11]“Tube Formulas for Self-Similar Fractals”, in: “Analysis on Graphs and its
Applications”, P. Exner, et al. (Eds.), Proceedings of Symposia in Pure Mathematics,
American Mathematical Society 77 (2008), pp. 211-230, (with E. P. J. Pearse). [Eprint: arXiv:math.DS/0711.0173v1, 2007. IHES/M/08/28, 2008.]

Published Book Chapters:[BC1]“The Problem of the Trotter-Lie Formula for Unitary Groups of Operators”, Séminaire
Choquet: Initiation à l'Analyse, Publications Mathématiques de l’Université Pierre etMarie Curie (Paris VI), 20ème année, 1980/81, 46 (1982), pp. 1701-1745; ZBL
519:47025.

[BC2]“Spectral and Fractal Geometry: From the Weyl-Berry Conjecture for Fractal Drums to
the Riemann Zeta-Function”, in “Differential Equations and Mathematical Physics”,
Proc. International Conference on Mathematical Physics and Differential Equations, heldin Birmingham in March 1990, C. Bennewitz (Ed.), Academic Press, 1992, pp. 151-182.

[BC3]“Vibrations of Fractal Drums, the Riemann Hypothesis, Waves in Fractal Media, and the
Weyl-Berry Conjecture”, in "Ordinary and Partial Differential Equations", Proc. TwelthInternational Conference on the Theory of Partial Differential Equations, held in Dundee(Scotland, UK) in June 1992, Vol. IV, B.D. Sleeman et al. (Eds.), Pitman Research Notes
in Mathematics Series, 289, Longman, UK, 1993, pp. 126-209.

[BC4]“Towards a Noncommutative Fractal Geometry? Laplacians and Volume Measures on
Fractals”, Contemporary Mathematics, American Mathematical Society 208 (1997),
pp. 211-252.

[BC5]“Computer Graphics and the Eigenfunctions for the Koch Snowflake Drum", in “Progress-7-

in Inverse Spectral Geometry”, Trends in Mathematics, Vol. 1, Birkhäuser-Verlag, Baseland Boston, 1997, pp. 95-109, (with C.A. Griffith). (Includes 10 computer graphics
plates).
[BC6]“Complex Dimensions of Fractal Strings and Oscillatory Phenomena in Fractal Geometry
and Arithmetic”, Contemporary Mathematics, American Mathematical Society 237(1999), pp. 87-105, (with M. van Frankenhuysen).

[BC7]“Spectral Geometry: An Introduction and Background Material for this Volume”, in“Progress in Inverse Spectral Geometry”, Trends in Mathematics, Vol. 1, BirkhäuserVerlag, Basel and Boston, 1997, pp. 1-15, (with S.I. Andersson).

[BC8]“A Prime Orbit Theorem for Self-Similar Flows and Diophantine Approximation”,
Contemporary Mathematics, American Mathematical Society 290 (2001), pp. 113-138,(with M. van Frankenhuysen). [E-print: arXiv:math.SP/0111067, 2001.][BC9]“T-Duality, Functional Equation, and Noncommutative Stringy Spacetime, in “Geometries
of Nature, Living Systems and Human Cognition: New Interactions of Mathematics with
the Natural Sciences and the Humanities”, L. Boi (Ed.), World Scientific Publ., Singapore,
2005, pp. 3-91.
[The volume in which this research book chapter has appeared is aimed at presenting the
research perspectives of several internationally known mathematicians, physicists,biologists and philosophers of science, at the beginning of the 21st century.][BC10] “Fractal Geometry and Applications—An Introduction to this Volume”, in Proceedings ofSymposia in Pure Mathematics, 72, Part 1, American Mathematical Society, Providence,
R.I., 2004, pp. 1-25.
[Front article for the two-part volume [EB4]-[EB5]; invited by the publishers of theAmerican Mathematical Society. It provides an introduction to the research area of fractal
geometry, describes several of its historical (mathematical) roots, gives an overview of thevolume and discusses some of the contributions of the founder of the subject, Benoît
Mandelbrot.][BC11] “Ihara Zeta Functions for Periodic Simple Graphs”, in: “C*-Algebras and Elliptic Theory
II”, Proceedings of a Conference held at the Banach Center in Warsaw, Poland, D.
Burghelea, R. Melrose, et al. (Eds.), Trends in Mathematics, Birkhäuser-Verlag, Basel,
2008, pp. 103-121, (with D. Guido and T. Isola). [E-print: arXiv:math.OA/0605753, 2006.
IHES/M/08/39, 2008.][BC12] “Bartholdi Zeta Functions for Periodic Simple Graphs”, in: “Analysis on Graphs and its
Applications”, P. Exner, et al. (Eds.), Proceedings of Symposia in Pure Mathematics,
American Mathematical Society 77 (2008), pp. 109-122, (with D. Guido and T. Isola). [Eprint: IHES/M/08/38, 2008.]-8-

[BC13] “Towards the Koch Snowflake Fractal Billiard: Computer Experiments andMathematical Conjectures”, in: “Gems in Experimental Mathematics”, T. Amdeberhan,
L. A. Medina and V. H. Moll (Eds.), Contemporary Mathematics, American
Mathematical Society, (with R. G. Niemeyer). [E-print: arXiv:math.DS:0912.3948v1,
2009.][BC14] “The Geometry of the $p$-Adic Fractal Strings: A Comparative Survey”, in: “Advancesin Non-Archimedian Analysis”, J. Araujo, B. Diarra and A. Escassot (Eds.),
Contemporary Mathematics, American Mathematical Society, Providence, RI, 551(2011), pp. 163-206, (with Hung Lu). [E-print: arXiv:1105.2966v1 [math.MG], 2011.][BC15] “Partition Zeta Functions, Multifractal Spectra, and Tapestries of Complex Dimensions”,
in: “Benoit Mandelbrot: A Life in Many Dimensions”, M. Frame (Ed.) World Scientific,
Singapore, 2012, 54 typed pages, (with K. E. Ellis, M. C. MacKenzie and J. A. Rock).
(Special volume in Memory of Benoit Mandelbrot.) [E-print: arXiv:1007.1467v1[math-ph], 2010.]

In Press Book Chapters:

Research Memoirs:[RM1] “Domaine de Dépendance”, [Domain of Dependence], Mémoire de l'Université Pierre etMarie Curie (Paris VI), 1978, 45 pages.

Reprinted Articles:[R1]“Generalized Dyson Series, Generalized Feynman Diagrams, the Feynman Integral andFeynman's Operational Calculus”, Memoirs of the American Mathematical Society
No. 351, 62 (1991), pp. 1-78, (with G.W. Johnson); reprint of [JA12].
[Reprinted by the American Mathematical Society in 1991.][R2]“Fractals and Vibrations: Can You Hear the Shape of a Fractal Drum?”, in Fractal
Geometry and Analysis: The Mandelbrot Festricht, Proc. Symposium on "Fractal
Geometry and Self-Similar Phenomena" in Honor of Prof. Benoit B. Mandelbrot's 70th
Birthday, held in Curaçao (Netherland Antilles, Feb. 1995). C.J.G. Evertsz, H.-O. Peitgen
and R.F. Voss (Eds.), World Scientific, Singapore, 1996, pp. 321-332; reprint of [JA35].

Pedagogical Articles:[PA1]“Creating and Teaching Undergraduate Courses and Seminars in Fractal Geometry: A-9-Personal Experience”, in: “Fractals, Graphics, and Mathematics Education”, B. B.
Mandelbrot and M. L. Frame (Eds.), Mathematical Association of America, Washington,
D. C. (and Cambridge University Press, Cambridge, UK), 2002, pp. 111-116. (Written
upon the invitation of Professor Benoit Mandelbrot.)

Encyclopedia Entry:[EE1]“The Sierpinski Gasket and Carpet”, Kluwer Encyclopedia of Mathematics, Suppl. Vol.
III, Kluwer Academic Publisher, 2002, pp. 364-368.

Undergraduate Research Article:[URA1] “Fractal Strings and Number Theory: The Harmonic String and the Prime String”,
Undergraduate Research Journal (UCR), II (2008), pp. 35-46, (with J. C. Payne). (Survey
article.) [re.pdf.]
Research Articles in Preparation:[Pr1]“Curvature Measures and Tube Formulas for the Generators of Self-Similar Tilings”, (withErin P. J. Pearse).

[Pr2]“Fractal Curvatures and Local Tube Formulas”, (with Erin P. J. Pearse and Steffen
Winter).

[Pr3]“Fractal Membranes as the Second Quantization of Fractal Strings”, (with Ryszard Nest).

[Pr4]“Functional Equations for Zeta Functions Associated with Quasicrystals and Fractal
Membranes”, (with Ryszard Nest).

[Pr5]“Quasicrystals, Zeta Functions, and Noncommutative Geometry”, (with Ryszard Nest).

[Pr6]“Density of Solutions of Dirichlet Polynomial Equations, with Applications to Fractality”,(with Machiel van Frankenhuijsen).

[Pr7]“p-Adic and Adelic Fractal Strings”, (with Hung Lu).

[Pr8]“Spectral Triples for Adelic Fractal Strings and Membranes”, (with Hung Lu).

[Pr9]“Partition Zeta Functions of Multifractal Mass Distributions”, (with John Rock).

[Pr10]“Complex Fractal Dimensions”, (with Erin Pearse and Machiel van Frankenhuijsen).

[Pr11]“Minkowski Measurability of Fractal Sprays and Self-Similar Tilings”, (with Steffen
Winter and Erin P. J. Pearse).
- 10 -

[Pr12]“Geometry of p-Adic Fractal Strings: Zeta Functions, Complex Dimensions and Tube
Formulas”, (with Hung Lu).

[Pr13]“Families of Periodic Orbits of the Koch Snowflake Fractal Billiard”, (with Robert G.
Niemeyer).

[Pr14]“Zeta Functions Associated with Fractal Sets in Euclidean Spaces”, (with Darko
Zubrinic).

[Pr15]“Analytic Continuation of a Class of Multifractal Zeta Functions”, (with Driss Essouabri
and John A. Rock).

[Pr16]“Invertibility of the Spectral Operator and a Reformulation of the Riemann Hypothesis”,(with Hafedh Herichi).

[Pr17]“Spectral Operator and Convergence of Its Euler Product in the Critical Strip”, (withHafedh Herichi).
------------------------------------------

Research Books:[RB1]“The Feynman Integral and Feynman's Operational Calculus”, Oxford Mathematical
Monographs, Oxford Science Publications, Oxford University Press, Oxford, London and
New York, approx. 800 pages (precisely, 771 + (xviii) pages & 21 illustrations),
March 2000. ISBN 0 19 853574 0 (Hbk). (With Gerald W. Johnson.) [Corrected
Reprinting, Jan. 2001. First Paperback Edition, Jan. 2002. ISBN 0 19 851572 3 (Pbk).
Second Reprinting: Jan. 2003. Electronic Edition: forthcoming.] US Library of Congress
Classification: QA312.J54 2000.
[This research treatise develops a mathematical theory of the beautiful but challenging
subject of the Feynman path integral approach to quantum physics, and of the closely
related topic of Feynman’s operational calculus for noncommuting operators. It was
written over a period of about ten years (Dec. 1989--Dec. 1999) and provides the mostcomplete mathematical treatment of these subjects to date.
Some advantages of the approaches to the Feynman integral which are treated indetail in this book are the following: the existence of the Feynman integral is establishedfor very general potentials in all four cases; under more restrictive but still broadconditions, three of these Feynman integrals agree with one another and with the unitarygroup from the usual approach to quantum dynamics; these same three Feynman integrals
possess pleasant stability properties. The background material in mathematics and physics- 11 -

that motivates the study of the Feynman integral and Feynman’s operational calculus isdiscussed, and detailed proofs are provided for the central results. The last chapter
discusses topics in contemporary physics and mathematics (including knot theory and lowdimensional topology) where heuristic Feynman integrals have played a significant role.]

Table of Contents of the Book [RB1]:
Preface. Acknowledgements.

Chp. 1: Introduction. 1.1: General Introductory Comments. Feynman’s path integral.
Feynman’s operational calculus. Feynman’s operational calculus via the Feynman and
Wiener integrals. Feynman’s operational calculus and evolution equations. Further workon or related to the Feynman integral: Chapter 20. 1.2: Recurring Themes and Their
Connections with the Feynman Integral and Feynman’s Operational Calculus. Productformulas and applications to the Feynman integral. Feynman-Kac formula: analytic
continuation in time and mass. The role of operator theory. Connections between the
Feynman-Kac and Trotter product formulas. Evolution equations. Functions ofnoncommuting operators. Time-ordered perturbation series. The use of measures. 1.3:
Relationship with the Motivating Physical Theories: Background and QuantumMechanical Models. Physical background. Highly singular potentials. Time-dependent
potentials. Phenomenological models: complex and nonlocal potentials. Prerequisites,
new material, and organization of the book.
Chp. 2: The Physical Phenomenon of Brownian Motion. 2.1: A Brief Historical Sketch.
2.2: Einstein’s Probabilistic Formula.
Chp. 3: Wiener Measure. 3.1: There is No Reasonable Translation Invariant Measure on
Wiener Space. 3.2: Construction of Wiener measure. 3.3: Wiener’s Integration Formulaand Applications. Finitely-based functions. Applications. Axiomatic description of the
Wiener process. 3.4: Nondifferentiability of Wiener Paths. d-dimensional Wiener measure
and Wiener process. 3.5: Appendix: Converse Measurability Results. 3.6: Appendix:
Β(X×Y) = Β(X) ⊗ Β(Y).
Chp. 4: Scaling in Wiener Space and the Analytic Feynman Integral. 4.1: Quadratic
Variation of Wiener Paths. 4.2: Scale Change in Wiener Space. 4.3: Translation
Pathologies. 4.4: Scale-Invariant Measurable Functions. 4.5: The Scalar-Valued Analytic
Feynman Integral. 4.6: The Nonexistence of Feynman’s “Measure”. 4.7: Appendix: Some
Useful Gaussian-Type Integrals. 4.8: Appendix: Proof of Formula (4.2.3a).
Chp. 5: Stochastic Processes and the Wiener Process. 5.1: Stochastic Processes andProbability Measures on Function Spaces. 5.2: The Kolmogorov Consistency Theorem.
5.3: Two Realizations of the Wiener Process.

- 12 -

Chp. 6: Quantum Dynamics and the Shrödinger Equation. 6.1: Hamiltonian Approachto Quantum Dynamics. 6.2: Transitions Amplitudes and Measurements. 6.3: The
Heisenberg Uncertainty Principle. 6.4: Hamiltonian for a System of Particles.
Chp. 7: The Feynman Integral: Heuristic Ideas and Mathematical Difficulties. 7.1:
Introduction. 7.2: Feynman’s Formula. Connections with classical mechanics: the methodof stationary phase. 7.3: Heuristic Derivation of the Schrödinger Equation. 7.4:
Feynman’s Approximation Formula. 7.5: Nelson’s Approach via the Trotter Product
Formula. The Trotter product formula. 7.6: The Approach via Analytic Continuation.
Chp. 8: Semigroups of Operators: An Informal Introduction.
Chp. 9: Linear Semigroups of Operators. 9.1: Infinitesimal Generator. Integral equation.
Evolution equation. Closed unbounded operators. 9.2: Examples of
Semigroups
and Their Generators. The translation semigroup. The heat semigroup.
The Poissonsemigroup. 9.3: The Resolvent. 9.4: Generation Theorems. The Hille- Yosida theorem.
Dissipative operators and the Lumer-Phillips theorem. 9.5:
Uniformly
Continuous and Weakly Continuous Semigroups. 9.6: Self-Adjoint
Operators,
Unitary Groups and Stone’s Theorem. 9.7: Perturbation Theorems.
Chp. 10: Unbounded Self-Adjoint Operators and Quadratic Forms. 10.1: Spectral
Theorem for Unbounded Self-Adjoint Operators. Multiplication operators. Three usefulforms of the spectral theorem. 10.2: Applications of the Spectral Theorem. The free
Hamiltonian Η0. The heat semigroup and unitary group. Standard cores for the free
Hamiltonian. Imaginary resolvents. 10.3: Representation Theorems for Unbounded
Quadratic Forms. Basic definitions and properties. Representation theorems for quadratic
forms. The form sum of operators. 10.4: Conditions on the Potential V forΗ0-Form Boundedness.

Chp. 11: Product Formulas with Applications to the Feynman Integral. 11.1: Trotter
and Chernoff Product Formulas. Product formulas for unitary groups. 11.2: Feynman
Integrals via the Trotter Product Formula. Criteria for essential self-adjointness of positive
operators. A brief outline of distribution theory. Kato’s distributional inequality.
Essential self-adjointness of the Hamiltonian Η = Η0 + V. Conditions on the potential V
for H0-operator -boundedness. Feynman integral via the Trotter product formula forunitary groups. 11.3: Product Formula for Imaginary Resolvents.
Hypotheses and statement of the main result. Proof of the product formula.
Consequences, extensions and open problems. 11.4: Application to the Modified
Feynman Integral. Modified Feynman integral and Schrödinger equation with singularpotential. Extensions: Riemannian manifolds and magnetic vector potentials. 11.5:
Dominated Convergence Theorem for the Modified Feynman Integral. Preliminaries.
Perturbation of form sums of self-adjoint operators. Application to a general dominatedconvergence theorem for Feynman integrals. 11.6: The Modified Feynman Integral for
Complex Potentials. Product formula for imaginary resolvents of normal operators.
- 13 -

Application to dissipative quantum systems. 11.7: Appendix: Extended Vitali’s Theorem
with Application to Unitary Groups. Extension of Vitali’s theorem for sequences ofanalytic functions. Analytic continuation and product formula for unitary groups.

Chp. 12: The Feynman-Kac Formula. 12.1: The Feynman-Kac Formula, the Heat
Equation and the Wiener Integral. 12.2: Proof of the Feynman-Kac Formula. Bounded
potentials. Monotone convergence theorems for forms and integrals. Unbounded
potentials. 12.3: Consequences.
Chp. 13: Analytic-in-Time or -Mass Operator-Valued Feynman Integrals.
13.1: Introduction. 13.2: The Analytic-in-Time Operator-Valued Feynman Integral.
13.3: Proof of Existence. 13.4: The Feynman Integrals Compared with One Another andwith the Unitary Group. Application to Stability Theorems. 13.5: The Analytic-in-Mass
Operator-Valued Feynman Integral. Definition of the analytic-in-mass operator-valued
Feynman integral. Nelson’s results. Haugsby’s results for time-dependent, complexvalued potentials. Further extensions via a product formula for semigroups. 13.6: The
Analytic-in-Mass Modified Feynman Integral. Existence of the analytic-in-mass modified
Feynman integral. Product formula for resolvents: the case of imaginary mass.
Comparison with other analytic-in-mass Feynman integrals. Highly singular central
potentials—the attractive inverse-square potential. 13.7: The Analytic-in-Time OperatorValued Feynman Integral via Additive Functionals of Brownian Motion. Introductory
remarks. The parallel with Section 13.3. Generalized signed measures. The generalized
Kato class. Capacity on Ρd. Smooth measures. Positive continuous additive functionals ofBrownian motion. The relationship between smooth measures and PCAFs. The analyticin-time operator-valued Feynman integral exists for elements of S – GKd. Examples.

Chp. 14: Feynman’s Operational Calculus for Noncommuting Operators: An
Introduction. 14.1: Functions of Operators. 14.2: The Rules for Feynman’s Operational
Calculus. Feynman’s time-ordering convention. Feynman’s heuristic rules. Twoelementary examples. 14.3: Time-Ordered Peturbation Series. Perturbation series via
Feynman’s operational calculus. Perturbation series via a path integral. The origins ofFeynman’s operational calculus. 14.4: Making Feynman’s Operational Calculus Rigorous.
I: Rigor via path integrals. II: Well-defined and useful formulas arrived at via Feynman’s
heuristic rules. III: A general theory of Feynman’s operational calculus withcomputations which are rigorous at every stage. 14.5: Feynman’s Operational Calculus
via Wiener and Feynman Integrals: Comments on Chapters 15-18.

Chp. 15: Generalized Dyson Series, the Feynman Integral and Feynman’s Operational
Calculus. 15.1: Introduction. 15.2: The Analytic Operator-Valued Feynman Integral.
Notation and definitions. The analytic (in mass) operator-valued Feynman integral K.
Preliminary results. 15.3: A Simple Generalized Dyson Series (η = μ + ω δτ}). The
Classical Dyson series. 15.4: Generalized Dyson Series: The General Case. 15.5:- 14 -

Disentangling via Perturbation Expansions: Examples. A single measure and potential.
Several measures and potentials. 15.6: Generalized Feynman Diagrams. 15.7:
Commutative Banach Algebras of Functionals. The disentangling algebras Αt. The timereversal map on Αt and the natural physical ordering. Connections with Feynman’s
operational calculus.

Chp. 16: Stability Results. 16.1: Stability in the Potentials. 16.2: Stability in the
Measures.

Chp. 17: The Feynman-Kac Formula with a Lebesgue-Stieltjes Measure andFeynman’s Operational Calculus. 17.1: Introduction. Notation and hypotheses. 17.2:
The Feynman-Kac Formula with a Lebesgue-Stieltjes Measure: Finitely Supported
Discrete Part ν. Integral equation (integrated form of the evolution equation).
Differential equation (differential form of the evolution equation). Discontinuities (intime) of the solution. Propagator and explicit solution. 17.3: Derivation of the Integral
Equation in a Simple Case (η = μ + ω δτ). Sketch of the proof when ν is finitely supported.
17.4: Discontinuities of the Solution to the Evolution Equation. The time discontinuities.
Differential equation and change of initial condition. 17.5: Explicit Solution and PhysicalInterpretations. Continuous measure: uniqueness of the solution. Measure with finitely
supported discrete part: propagator and explicit solution. Physical interpretations in thequantum-mechanical case. Physical interpretations in the diffusion case. Further
connections with Feynman’s operational calculus. 17.6: The Feynman-Kac Formula witha Lebesgue-Stieltjes Measure: The General Case (Arbitrary Measure η). Integral equation(integrated form of the evolution equation). Basic properties of the solution to the integral
equation. Quantum-mechanical case: reformulation in the interaction (or Dirac) picture.
Product integral representation of the solution. Distributional differential equation (truedifferential form of the evolution equation). Unitary propagators. Scattering matrix andimproper product integral. Sketch of the proof of the integral equation.

Chp. 18: Noncommutative Operations on Wiener Functionals, Disentangling Algebras
and Feynman’s Operational Calculus. 18.1: Introduction. 18.2: Preliminaries: Maps,
Measures and Measurability. 18.3: The Noncommutative Operations * and +°. 18.4:
The Functional Integrals Kλt and the Operations * and +°. 18.5: The Disentangling
Algebras Αt, the Operations * and +°, and the Disentangling Process. Examples:
trigonometric, binomial and exponential formulas. 18.6: Appendix: Quantization,
Axiomatic Feynman’s Operational Calculus, and Generalized Functional Integral.
Algebraic and analytic axioms. Consequences of the axioms. Examples: the disentangling
algebras and analytic Feynman integrals.

Chp. 19: Feynman’s Operational Calculus and Evolution Equations. 19.1: Introductionand Hypotheses. Feynman’s operational calculus as a generalized path integral.
- 15 -

Exponentials of sums of noncommuting operators. Disentangling exponentials of sums
via perturbation series. Local and nonlocal potentials. Hypotheses. 19.2: Disentangling
exp[-tα + \int_{0}^{t} β(s) μ(ds)]. 19.3: Disentangling exp[-tα + \int_{0}^{t} β1(s) μ1(ds)+ ∝ + \int_{0}^{t} βn(s) μn(ds)]. 19.4: Convergence of the Disentangled Series. 19.5:
The Evolution Equation. 19.6: Uniqueness of the Solution to the Evolution Equation. 19.7:
Further Examples of the Disentangling Process. Nonlocal potentials relevant tophenomenological nuclear theory.

Chp. 20: Further Work on or Related to the Feynman Integral. 20.1: Transform
Approaches to the Feynman Integral. References to Further Approaches.
A. The Fresnel Integral and Other Transform Approaches to the Feynman
Integral. The Fresnel integral. Properties of the Fresnel integral. An approach to the
Feynman integral via the Fresnel integral. Advantages and disadvantages of Fresnel
integral approaches to the Feynman integral. The Feynman map. The Poisson process
and transforms. A “Fresnel integral” on classical Wiener space. The Banach algebras Σand Φ(Η1) are the same. Consequences of the close relationship between Σ and Φ(Η1).
More Functions in Φ(Η1). A unified theory of Fresnel integrals: introductory remarks.
Background material. A unified theory of Fresnel integrals (continued). The Fresnel
classes along with quadratic forms. The classes Γq(Η) and Γq(B). Quadratic forms
extended. Functions in the Fresnel class of an abstract Wiener space: examples of abstract
Wiener spaces. Fourier-Feynman transforms, convolution, and the first variation forfunctions in Σ.
B. References to Further Approaches to the Feynman Integral. 20.2: The Influenceof Heuristic Feynman Integrals on Contemporary Mathematics and Physics: Some
Examples.
A. Knot Invariants and Low-Dimensional Topology. The Jones polynomial
invariant for knots and links. Witten’s topological invariants via Feynman path integrals.
Further developments: Vassiliev invariants and the Kontsevich integral.
B. Further Comments and References on Subjects Related to the Feynman Integral.
Supersymmetric Feynman path integrals and the Atiyah-Singer index theorem.
Deformation quantization: star products and perturbation series. Gauge field theory andFeynman path integrals. String theory: Feynman-Polyakov integrals, and dualities. Whatlies ahead? Towards a geometrization of Feynman path integrals.

References.
Index of Symbols. Author Index. Subject Index.
--------------------------------------------------[RB2]“Fractal Geometry and Number Theory”. (Subtitle: “Complex Dimensions of Fractal
Strings and Zeros of Zeta Functions”.) Research Monograph, Birkhäuser-Verlag, Boston,
approx. 300 pages (precisely, 268 + (xii) pages & 26 illustrations), January 2000. (With- 16 -

Machiel van Frankenhuysen.) ISBN 0-8176-4098-3. (Boston). ISBN 3-7643-4098-3(Basel). US Library of Congress Classification: QA614.86.L36 1999.
[This (refereed) research monograph consists entirely of new research carried out by theauthors over a period of about five years (March 1995--Nov. 1999). It develops amathematical theory of ‘complex dimensions’ of fractal strings, and of the oscillations
intrinsic to the geometry and the spectrum of the associated fractals. In particular, newresults about the critical zeros of zeta functions are established and a geometricreformulation of the (Extended) Riemann Hypothesis is obtained in terms of the notion ofcomplex dimension and of the frequency spectrum of fractal strings. On the fractal side, forexample, precise explicit formulas are obtained for the volume of tubular neighborhoods ofself-similar (and other fractal) strings.
In the long-term, this work is aimed at putting fractal geometry in an arithmetic
context and, conversely, at putting various aspects of number theory (such as the theory of
Dirichlet series, for example) in a geometric framework.]--------------------------------------------------[RB3]“Fractal Geometry, Complex Dimensions and Zeta Functions”, (Subtitle: “Geometry andSpectra of Fractal Strings”.) Refereed Research Monograph, Springer Monographs in
Mathematics, Springer-Verlag, New York, approx. 490 pages (precisely, 460 + (xxiv)
pages & 54 illustrations), August 2006. (With Machiel van Frankenhuijsen.) ISBN-10: 0387-33285-5. e-ISBN: 0-387-35208-2. ISBN-13: 978-0-387-33285-7. US Library ofCongress Control Number: 2006929212.
This is a sequel to and a greatly expanded version of the theory of complex fractal
dimensions first developed in [RB2]. It contains a large amount of new research material(including several new chapters, sections, and appendices, along with many new examples
and applications), almost all of which is directly connected to the work of the authors (andtheir collaborators) since the publication of [RB2], and a portion of which appeared in print
for the first time in the present book.

Overview (of the approx. 200 pages of new material): New chapters on ‘self-similar flows’ (Chp. 7)
and on ‘quasiperiodic patterns of self-similar strings’ (Chp. 3), providing a much more precise
understanding (than in [RB2]) of the complex dimensions of (nonlattice) self-similar fractals (in IR)
and dynamical systems, as well as of the error terms in the associated ‘explicit formulas’. A new
geometric description of self-similar fractal strings (in §2.1.1) and a discussion of self-similar strings
with multiple generators (in Chp. 2 and throughout the rest of the book). New (and previously
entirely unpublished) section (§6.3.3) on an (operator-valued) Euler product attached to the spectrumof a fractal string (generalizing that for the Riemann zeta function ζ (s ) but also converging in thecritical strip 0 < Re s < 1 ); study of the eigenvalue spectrum of the corresponding ‘spectral operator’.
New pointwise tube formulas (§8.1.1), with a number of new applications to tube formulas for selfsimilar strings (in §8.4); new results on average Minkowski content (§8.4.3) and on error terms for- 17 -

nonlattice strings (§8.4.4). New sections (§11.1.1 and §11.4.1) on recent results on zeros of zetafunctions in finite arithmetic progressions (extending those of the authors in §9.2 and §9.3 ofChapter 9 of [RB2]). Discussion in the last chapter (Chp. 12) of a number of new topics, including
recent results on random fractal strings, quantized strings (fractal membranes), and especially on thecomplex dimensions of the Koch snowflake curve and its generalizations (via an associated ‘tube
formula’), as well as of an outline of a higher-dimensional theory of complex dimensions of selfsimilar systems and fractals. Also, further discussion of a possible cohomological interpretation of
the complex dimensions. New appendix (App. A) on Nevanlinna theory and its applications in thiscontext, and a new section (§B.4 of App. B) on ‘two-variable zeta functions’. New examples,
illustrations, theorems, and proofs, scattered throughout the book.]
Table of Contents of the Book [RB3]:
Preface. List of Figures. List of Tables.
Overview. Introduction.
Chp. 1: Complex Dimensions of Ordinary Fractal Strings. 1.1: The Geometry of a
Fractal String. 1.1.1: The multiplicity of the lengths. 1.1.2: Example: the Cantor string.
1.2: The Geometric Zeta Function of a Fractal String. 1.2.1: The screen and the window.
1.2.2: The Cantor string (continued). 1.3: The Frequencies of a Fractal String and theSpectral Zeta Function. 1.4: Higher-Dimensional Analogue: Fractal Sprays. 1.5. Notes.
Chp. 2: Complex Dimensions of Self-Similar Fractal Strings. 2.1: Construction of a
Self-Similar Fractal String. 2.1.1: Relation with self-similar sets. 2.2: The Geometric
Zeta Function of a Self-Similar String. 2.2.1: Self-similar strings with a single gap.
2.3: Examples of Complex Dimensions of Self-Similar Strings. 2.3.1: The Cantor string.
2.3.2: The Fibonacci string. 2.3.3: The modified Cantor and Fibonacci strings. 2.3.4:
A string with multiple poles. 2.3.5: Two nonlattice examples: the two-three string and thegolden string. 2.4: The Lattice and Nonlattice Case. 2.5: The Structure of the Complex
Dimensions. 2.6: The Asymptotic Density of the Poles in the Nonlattice Case. 2.7: Notes.
Chp. 3: Complex Dimensions of Nonlattice Self-Similar Strings: Quasiperiodic Patterns
and Diophantine Approximation. 3.1: Dirichlet Polynomial Equations. 3.1.1: The genericnonlattice case. 3.2: Examples of Dirichlet Polynomial Equations. 3.21: Generic andnongeneric nonlattice equations. 3.2.2: The complex roots of the golden plus equation. 3.3:
The Structure of the Complex Roots. 3.4: Approximation of a Nonlattice Equation by
Lattice Equations. 3.4.1: Diophantine approximation. 3.4.2: The quasiperiodic pattern ofthe complex dimensions. 3.4.3: Applications to nonlattice strings. 3.5: Complex Roots ofa Nonlattice Dirichlet Polynomial. 3.5.1: Continued fractions. 3.5.2: Two generators.
3.5.3: More than two generators. 3.6: Dimension-Free Regions. 3.7: The Dimensions ofFractality of a Nonlattice String. 3.7.1: The density of the real parts. 3.8: A Note on theComputations.
Chp. 4: Generalized Fractal Strings Viewed as Measures. 4.1: Generalized Fractal
Strings. 4.1.1: Examples of generalized fractal strings. 4.2: The Frequencies of a
- 18 -

Generalized Fractal String. 4.2.1: Completion of the harmonic string: Euler product.
4.3: Generalized Fractal Sprays. 4.4: The Measure of a Self-Similar String. 4.4.1: Measureswith a self-similarity property. 4.5: Notes.
Chp. 5: Explicit Formulas for Generalized Fractal Strings. 5.1: Introduction. 5.1.1:
Outline of the proof. 5.1.2: Examples. 5.2: Preliminaries: The Heaviside Function.
5.3: Pointwise Explicit Formulas. 5.3.1: The order of the sum over the complex
dimensions. 5.4: Distributional Explicit Formulas. 5.4.1: Extension to more general test
functions. 5.4.2: The order of the distributional error term. 5.5: Example: The Prime
Number Theorem. 5.5.1: The Riemann-von Mangoldt formula. 5.6: Notes.
Chp. 6: The Geometry and the Spectrum of Fractal Strings. 6.1: The Local Terms in the
Explicit Formulas. 6.1.1: The geometric local terms. 6.1.2: The spectral local terms.
6.1.3: The Weyl term. 6.1.4: The distribution xω (log x)m. 6.2: Explicit Formulas for
Lengths and Frequencies. 6.2.1: The geometric counting function of a fractal string.
6.2.2: The spectral counting function of a fractal string. 6.2.3: The geometric and spectral
partition functions. 6.3: The Direct Spectral Problem for Fractal Strings. 6.3.1: The densityof geometric and spectral states. 6.3.2: The spectral operator and its Euler product. 6.4:
Self-Similar Strings. 6.4.1: Lattice strings. 6.4.2: Nonlattice strings. 6.4.3: The spectrum of
a self-similar string. 6.5: Examples of Non-Self-Similar Strings. 6.5.1:
The a-string. 6.5.2: The spectrum of the harmonic string. 6.6: Fractal Sprays. 6.6.1: The
Sierpinski drum. 6.6.2: The spectrum of a self-similar spray.
Chp. 7: Periodic Orbits of Self-Similar Flows. 7.1: Suspended Flows. 7.1.1: The zetafunction of a dynamical system. 7.2: Periodic Orbits, Euler Product. 7.3: Self-Similar
Flows. 7.3.1: Examples of self-similar flows. 7.3.2: The lattice and nonlattice case. 7.4:
The Prime Orbit Theorem for Suspended Flows. 7.4.1: The prime orbit theorem for selfsimilar flows. 7.4.2: Lattice flows 7.4.3: Nonlattice flows. 7.5: The Error Term in the
Nonlattice Case. 7.5.1: Two generators. 7.5.2: More than two generators. 7.6: Notes.
Chp. 8: Tubular Neighborhoods and Minkowski Measurability. 8.1: Explicit Formulas
for the Volume of Tubular Neighborhoods. 8.1.1: The pointwise tube formula. 8.1.2:
Example: the a-string. 8.2: Analogy with Riemannian Geometry. 8.3: Minkowski
Measurability and Complex Dimensions. 8.4: Tube Formulas for Self-Similar Strings.
8.4.1: Generalized Cantor strings. 8.4.2: Lattice self-similar strings. 8.4.3: The average
Minkowski content. 8.4.4: Nonlattice self-similar strings.
Chp. 9: The Riemann Hypothesis and Inverse Spectral Problems. 9.1: The Inverse
Spectral Problem. 9.2: Complex Dimensions of Fractal Strings and the RiemannHypothesis. 9.3: Fractal Sprays and the Generalized Riemann Hypothesis. 9.4: Notes.
Chp. 10: Generalized Cantor Strings and Their Oscillations. 10.1: The Geometry of aGeneralized Cantor String. 10.2: The Spectrum of a Generalized Cantor String. 10.2.1:
Integral Cantor strings: a-adic analysis of the geometric and spectral oscillations. 10.2.2:
Nonintegral Cantor strings: analysis of the jumps in the spectral counting function. 10.3:- 19 -

The Truncated Cantor String. 10.3.1: The spectrum of the truncated Cantor string. 10.4:
Notes.
Chp. 11: The Critical Zeros of Zeta Functions. 11.1: The Riemann Zeta Function: No
Critical Zeros in Arithmetic Progression. 11.1.1: Finite arithmetic progressions of zeros.
11.2: Extension to Other Zeta Functions. 11.3: Density of Nonzeros on Vertical Lines.
11.3.1: Almost arithmetic progressions of zeros. 11.4: Extensions to L-Series. 11.4.1:
Finite arithmetic progressions of zeros of L-series. 11.5: Zeta Functions of Curves Over
Finite Fields.

Chp. 12: Concluding Comments, Open Problems, and Perspectives. 12.1: Conjectures
about Zeros of Dirichlet Series. 12.2: A New Definition of Fractality. 12.2.1: Fractal
geometers’ intuition of fractality. 12.2.2: Our definition of fractality. 12.2.3: Possible
connections with the notion of lacunarity. 12.3: Fractality and Self-Similarity. 12.3.1:
Complex dimensions and tube formula for the Koch snowflake curve. 12.3.2: Towards ahigher-dimensional theory of complex dimensions. 12.4: Random and Quantized Fractal
Strings. 12.4.1: Random fractal strings and their zeta functions. 12.4.2: Fractal
membranes: quantized fractal strings. 12.5: The Spectrum of a Fractal Drum. 12.5.1: The
Weyl-Berry conjecture. 12.5.2: The spectrum of a self-similar drum. 12.5.3: Spectrum andperiodic orbits. 12.6: The Complex Dimensions as the Spectrum of Shifts. 12.7: The
Complex Dimensions as Geometric Invariants. 12.7.1: Connections with varieties overfinite fields. 12.7.2: Complex cohomology of self-similar strings. 12.8: Notes.
Appendix A: Zeta Functions in Number Theory. A.1. The Dedekind Zeta Function.
A.2. Characters and Hecke L-Series. A.3. Completion of L-Series, Functional Equation.
A.4. Epstein Zeta Functions. A.5. Two-Variable Zeta Functions. A.5.1: The zeta functionof Pellikaan. A.5.2: The zeta function of Schoof and van der Geer. A.6: Other Zeta
Functions in Number Theory.
Appendix B: Zeta Functions of Laplacians and Spectral Asymptotics. B.1: Weyl’s
Asymptotic Formula. B.2: Heat Asymptotic Expansion. B.3: The Spectral Zeta Function
and Its Poles. B.4: Extensions. B.4.1: Monotonic Second Term. B.5: Notes.
Appendix C: An Application of Nevanlinna Theory. C.1: The Nevanlinna Height.
C.2: Complex Zeros of Dirichlet Polynomials.
Bibliography. Acknowledgements.
Conventions. Index of Symbols. Author Index. Subject Index.
---------------------------------------------- 20 -

[RB4] “In Search of the Riemann Zeros. (Subtitle: Strings, Fractal Membranes andNoncommutative Spacetimes”.) American Mathematical Society, Providence, R I,
2008, 600 pages (precisely, 558+(xxix) pp.), January, 2008. ISBN-10: 0-8218-422-5.
ISBN-13:978-0-8218-4222-5. US Library of Congress Classification: QA333.L37
2007.

[The (physically motivated) theory proposed and developed in this research monographrepresents approximately ten years of the author’s research on this subject (between about
1996 and 2006). It realizes a synthesis of aspects of string theory, noncommutative
geometry, the author (and his collaborators)’ theory of fractal strings (now ‘quantized’ andreferred to in this new form as ‘fractal membranes’) and their complex dimensions, as well
as of number theory and arithmetic geometry. In particular, it builds upon and expands—
but is also in many ways quite different from—the author’s earlier (joint) work in [JA2427] or in [RB2, RB3]. Much of the material presented in the main part of this book (withthe exception of a portion of Chapter 2 and the first section of Chapter 3) is original andpublished for the first time.]

Table of Contents of the Book [RB4]:
Preface. Overview.
Chp. 1: Introduction. 1.1: Arithmetic and Spacetime Geometry. 1.2.: Riemannian,
Quantum and Noncommutative Geometry. 1.3: String Theory and Spacetime Geometry.
1.4: The Riemann Hypothesis and the Geometry of the Primes. 1.5: Objectives,
Motivations and Plan of this Book.
Chp. 2: String Theory on a Circle and T-Duality: Analogy with the Riemann Zeta
Function. 2.1: Quantum Mechanical Point-Particle on a Circle. 2.2: String Theory on a
Circle and the Existence of a Fundamental Length. 2.2.1: String theory on a circle. 2.2.2:
Circle duality (Τ-duality for circular spacetimes). 2.2.3: Τ-duality and the existence of afundamental length. 2.3: Noncommutative Stringy Spacetimes and Τ-Duality. 2.3.1: Target
space duality and noncommutative geometry. 2.3.2: Noncommutative stringy spacetimes:
Fock spaces, vertex algebras and chiral Dirac operators. 2.4: Analogy with the Riemann
Zeta Function: Functional Equation and Τ-Duality. 2.4.1: Key properties of the Riemannzeta function. 2.4.2: The functional equation, Τ-duality and the Riemann hypothesis.
2.5: Notes.
Chp. 3: Fractal Strings and Fractal Membranes. 3.1: Fractal Strings: Geometric Zeta
Functions, Complex Dimensions and Self-Similarity. 3.1.1: The spectrum of a fractal
string. 3.2: Fractal (and Prime) Membranes: Spectral Partition Functions and Euler
Products. 3.2.1: Prime membranes. 3.2.2: Fractal membranes and Euler products.
3.3: Fractal Membranes vs. Self-Similarity: Self-Similar Membranes. 3.4: Notes.

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Chp. 4: Noncommutative Models of Fractal Strings: Fractal Membranes and Beyond.
4.1: Connes’ Spectral Triple for Fractal Strings. 4.2: Fractal Membranes and the Second
Quantization of Fractal Strings. 4.2.1: An alternative construction of fractal membranes.
4.3: Fractal Membranes and Noncommutative Stringy Spacetimes. 4.4: Cyclic
Cohomology and a Possible Interpretation of (Dynamical) Complex Dimensions. 4.4.1:
Fractal membranes and quantum deformations: a possible connection with Haran’s realand finite primes. 4.5: Notes.

Chp. 5: Towards an ‘Arithmetic Site’: Moduli Spaces of Fractal Strings andMembranes. 5.1: The Set of Penrose Tilings: Quantum Space as a Quotient Space.
5.2: The Moduli Space of Fractal Strings: A Natural Receptacle for Zeta Functions.
5.3: The Moduli Space of Fractal Membranes: A Quantized Moduli Space of Fractal
Strings. 5.4: Arithmetic Site, Frobenius Flow and the Riemann Hypothesis. 5.4.1: The
moduli space of fractal strings and Deninger’s arithmetic site. 5.4.2: The moduli spaceof fractal membranes and (noncommutative) modular flow vs. arithmetic site andFrobenius flow. (5.4.2a: Factors and their classification. 5.4.2b: Modular theory of von
Neumann algebras. 5.4.2c: Reduction of type III to type II factors: automorphisms andflows. 5.4.2d: Noncommutative flows on moduli spaces and the Riemann hypothesis.
5.4.2e: Towards an extended moduli space and flow.) 5.5: Flows of Zeros and Zeta
Functions: A Dynamical Interpretation of the Riemann Hypothesis. 5.5.1. Introduction.
5.5.2. Expected Properties of the Flows of Zeros and Zeta Functions. 5.5.3. Analogies
with Other Geometric, Analytical or Physical Flows. (5.5.3a. Singular Potentials,
Schrödinger Equation and Renormalization Flow. 5.5.3b. KMS Flow and Deformationsof Pólya-Hilbert Operators. 5.5.3c. Ricci Flow and Geometric Homogenization. 5.5.3d.
Noncommutative KP and Geodesic Flow.) 5.6: Notes.
Appendix A: Vertex Algebras. A.1: Definition of Vertex Algebras: Translation and Scaling
Operators. A.2: Basic Properties of Vertex Algebras. A.3: Notes.
Appendix B: The Weil Conjectures and the Riemann Hypothesis. B.1: Varieties Over
Finite Fields and Their Zeta Functions. B.2: Zeta Functions of Curves Over Finite Fields
and the Riemann Hypothesis. B.3: The Weil Conjectures for Varieties Over Finite Fields.
B.4: Notes.
Appendix C: The Poisson Summation Formula, with Applications. C.1: General PSF for
Dual Lattices: Scalar Identity and Distributional Form. C.2: Application: Modularity of
Theta Functions. C.3: Key Special Case: Self-Dual PSF. C.4: Proof of the General Poisson
Summation Formula. C.5: Modular Forms and Their Hecke L-Series. C.5.1: Modular
forms and cusp forms. C.5.2: Hecke operators and Hecke forms. C.5.3: Hecke L-series ofa modular form. C.5.4: Modular forms of higher level and their L-functions. C.6: Notes.
Appendix D: Generalized Primes and Beurling Zeta Functions. D.1: Generalized Primes
Π and Integers Ν. D.2: Beurling Zeta Functions ςΠ. D.3: Analogues of the Prime Number
Theorem. D.4: Analytic Continuation and a Generalized Functional Equation for ςΠ. D.5:
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Partial Orderings on Generalized Integers. D.6: Notes.
Appendix E: The Selberg Class of Zeta Functions. E.1: Definition of the Selberg Class.
E.2: The Selberg Conjectures. E.3: Selected Consequences. E.4: The Selberg Class, Artin
L-Series and Automorphic L-Functions: Langlands’ Reciprocity Laws. E.4.1: Selberg’s
orthonormality conjecture and Artin L-series: Artin’s holomorphy conjecture. E.4.2:
Selberg’s orthonormality conjecture and automorphic representations: Langlands’
reciprocity conjecture. (E.4.2a: Adeles kΑ and the linear group GL(n;kΑ). E.4.2b:
Automorphic representations and automorphic L-series.) E.5: Notes.
Appendix F: The Noncommutative Space of Penrose Tilings and Quasicrystals.
F.1: Combinatorial Coding of Penrose Tilings and Consequences. F.2: Groupoid
C*-Algebra and the Noncommutative Space of Penrose Tilings. F.2.1: Groupoids:
definition and examples. F.2.2: The Groupoid convolution algebra. F.2.3: Generalization:groupoids, quasicrystals and noncommutative spaces. F.3: Quasicrystals: Dynamical Hulland Noncommutative Brillouin Zone. F.3.1: Mathematical quasicrystals and theirgeneralizations. F.3.2: Translation dynamical system: the hull of a quasicrystal. F.3.3:
Typical properties of atomic configurations. F.3.4: The noncommutative Brillouin zone
(and groupoid C*-algebra) of a quasicrystal. F.4: Notes.
Acknowledgements. Bibliography.
Conventions. Index of Symbols. Author Index. Subject Index.

-------------------------------------------------

Refereed Edited Research Books:[EB1]

Editor: "Progress in Inverse Spectral Geometry", Proc. Summer School on "Progress inInverse Spectral Geometry", held in Stockholm (Sweden) in June-July 1994, Trends inMathematics Series, Vol. 1, Birkhäuser-Verlag, Basel, November 1997, 204 pages, (CoEditor: Stig I. Andersson). ISBN 3-7643-5755-X (Basel). ISBN 0-8176-5755-X (Boston).
US Library of Congress Classification: QA614.95.P78 1997.
[This volume gathers original research contributions or survey expository articles by someof the best experts in spectral geometry, along with a few papers by promising juniorinvestigators selected by the editors. With two exceptions, the editors have reviewed andedited each paper individually.][EB2]

Coordinating Editor: “Harmonic Analysis and Nonlinear Differential Equations”,(Volume in honor of Prof. Victor L. Shapiro), Contemporary Mathematics, Vol. 208,
- 23 -

American Mathematical Society, Providence, RI, August 1997, 350 + (xii) pages.
(Includes a Dedication and a Preface.) (Co-Editors: Lawrence H. Harper and Adolfo J.
Rumbos.) ISBN 0-8218-0565-7 (alk. paper). US Library of Congress Classification:
QA403.H223 1997.
[This volume gathers high quality original research contributions or survey expository
articles by some of the leading experts in classical and modern analysis, working in theareas of harmonic analysis, nonlinear partial differential and mathematical physics. Eachcontribution in this volume has been individually refereed according to strict standards set
by the American Mathematical Society.][EB3]

Editor: “Dynamical, Spectral and Arithmetic Zeta Functions”, Proc. Special Session(Amer. Math. Soc. Annual Meeting, San Antonio, Texas, Jan. 1999), Contemporary
Mathematics, Vol. 290, American Mathematical Society, Providence, RI, December 2001,
195 + (x) pages. (Co-Editor: Machiel van Frankenhuysen.) ISBN 0-8218-2079-6 (alk.
paper). US Library of Congress Classification: QA351.A73 1999.
[This volume gathers high quality original research contributions or survey expository
articles by some of the leading experts working at the interface of number theory,
dynamical systems and/or spectral as well as arithmetic geometry. Each contribution in thevolume has been individually refereed according to strict standards set by the American
Mathematical Society.][EB4] & [EB5]:Managing Editor: “Fractal Geometry and Applications”. (Subtitle: “A Jubilee of Benoît
Mandelbrot”.) [Two volumes (Parts 1 & 2), totaling approximately 1,100 pages (precisely,
1,080 + (xxvi) pages).] Proceedings of Symposia in Pure Mathematics (PSPUM),
American Mathematical Society, Vol. 72, Parts 1 & 2, Providence, RI, Dec. 2004.
(Co-Editor: Machiel van Frankenhuijsen.) ISBN 0-8218-3292-1 (set: acid free paper).
ISBN 0-8218-3637-4 (part 1: acid free paper). ISBN 0-8218-3638-2 (part 2: acid freepaper). US Library of Congress Classification: QA325.F73 2004.
Subtitle of Part 1: Analysis, Number Theory, and Dynamical Systems. (Approx. 520
pages; precisely, 508 + (xiii) pages.)
Subtitle of Part 2: Multifractals, Probability and Statistical Mechanics, Applications.
(Approx. 560 pages; precisely, 546 + (xiii) pages.)[The PSPUM Series is the most prestigious proceedings series published by the American
Mathematical Society. Very few volumes are published every year (or decade). (Thepreparation of the present two-part volume has taken about three years.) In part for thisreason, as the Managing Editor of the volume (i.e., of both Parts 1 and 2), I have devoted agreat deal of attention and care to the selection of the invited contributors, the refereeing
process (drawing upon more than forty expert referees), and the editing of the volume..
This has been an extremely time-consuming task for me, spanning over hundreds of hours,- 24 -

but one that I think will be ultimately worthwhile and useful to the mathematical as well as
the broader scientific community.
The goal of these two books is to give an overview of the field of fractal geometry and of
its applications [within mathematics (e.g., harmonic analysis, dynamical systems, number
theory, probability, and mathematical physics) as well as to the other sciences (e.g.,physics, chemistry, engineering, and computer graphics)], via a careful selection ofresearch expository articles, tutorial articles, and original research papers. It should beaccessible and useful to experts and non-experts alike.]

Books in Preparation:[RB5]
Research Monograph: "Feynman's Operational Calculus and Beyond". (Subtitle:“Noncommutativity and Time-Ordering”.) (With Gerald W. Johnson and Lance Nielsen.)[RB6]
Research Monograph: “Fractal Geometry, Complex Dimensions and Zeta Functions”.
(Subtitle: "Geometry and Spectra of Fractal Strings".) Second Edition (Revised and Enlarged Second
Edition), Springer Monographs in Mathematics, Springer-Verlag, New York; expected publication
date: 2010. (With Machiel van Frankenhuijsen.) [Second edition written upon the request of the
publisher, Springer-Verlag. Contract signed with Springer-Verlag on 03/21/2009.)[TB]
Textbook: “An Invitation to Fractal Geometry”. (Subtitle: “Dimension Theory, Zeta
Functions, and Applications”.) (With Robert G. Niemeyer and John A. Rock.)
Theses:[T1]“Généralisation de la Formule de Trotter-Lie. Étude de Quelques Problèmes Liés à desGroupes Unitaires”. (Generalisation of the Trotter-Lie Formula. Study of Several
Problems Connected with Unitary Groups.) Thèse de Doctorat de Troisième Cycle (Ph.D.
Dissertation). Mathématiques. Université Pierre et Marie Curie (Paris VI), Paris, France,
93 + (iii) pages, 1980.

[T2]“Formule de Trotter et Calcul Opérationnel de Feynman”. (Trotter's Formula andFeynman's Operational Calculus.)Thèse de Doctorat D'Etat ès Sciences.
Mathématiques. Université Pierre et Marie Curie (Paris VI), Paris, France, 360 + (iv)
pages, 1986. [Doctorate ès Sciences Dissertation. Counterpart of a German Habilitation,
well beyond a regular Ph.D. It used to be needed to become the analog of a Full Professor
at the University in France. It was refereed by anonymous experts and by a University ofParis central commission of specialists composed of well-known mathematicians. The‘Thèse d’Etat’ has now been replaced by “l’Habilitation to Direct Research”, which theauthor has also defended at the Université Paris VI (in 1987).][Part I: Formules de Trotter et Intégrales de Feynman. Part II: Problèmes aux- 25 -

Valeurs Propres Elliptiques avec un Poids Indéfini. Part III: Calcul Opérationnel deFeynman. (Part I: Trotter Formulas and Feynman Integrals. Part II: Elliptic
Eigenvalue Problems with an Indefinite Weight. Part III: Feynman's Operational
Calculus.)]- 26 -