Approximation and computation in science and engineering Rearrangements L superadditivity and Jensen type inequalities (Abramovich) Approximate generalized Jensen mappings in 2 Banach spaces (Almahalebi) The asymptotic expansion for a class of convergent sequences defined by integrals (Andrica) Weak Pseudoprimality Associated with the Generalized Lucas Sequences (Rassias) Shift Invariant Spaces of Periodic Functions: Characterization Approximation and Applications (Atreas). Generalized intensity dependent multiphoton Jaynes Cummings model (N. Merlemis) Functional inequalities for multi additive quadratic cubic mappings (Bodaghi) Generalizations of Truncated M Fractional Derivative Associated with (p k) Mittag Leffler function With Classical Properties (Agarwal) On Hyers Ulam Rassias stability of a Volterra Hammerstein functional integral equation (Marian) Analysis of Electroencephalography (EEG) signals based on the HaarWavelet transformation (P. Papadopoulos) Perov type contractions (Karapinar) On a logarithmic equation by primes (S. I. Dimitrov) Hermite Hadamard trapezoid and mid point divergences (Dragomir) Hermite Hadamard type integral inequalities for perspective function (Dragomir) On the maximum value of a multi variable function (Hassani) Image reconstruction for positron emission tomography based on Chebyshev polynomials (Kalantonis) Approximation by Mixed Operators of Max Product Choquet Type (G. Gal) On the Approximation of Extinction Time for the Discrete Time Birth Death Circuit Chains in Random Environments (Ganatsiou) Some hyperstability results in Non Archimedean 2 Banach space for a $\\sigma$ Jensen functional equation (Ghali) A characterization for the validity of the Hermite Hadamard inequality on a simplex (Guessab) On the stability of the triangular equilibrium points in the photogravitational R3BP with an oblate infinitesimal and triaxial primaries for the binary Lalande 21258 system (E. Perdiou) Normalized Symmetric Differential Operators in the Open Unit Disk (W. Ibrahim) New Hermite Hadamard inequalities concerning twice differentiable generalized $\\psi$ convex mappings via conformable fractional integrals (Kashuri) Some new fractional inequalities using n polynomials s type convexity (Kashuri) Hyperstability of orthogonally 3 Lie homomorphism: an orthogonally fixed point approach (Keshavarz) Some New Inequalities for Fractional Integral Operators (J. Kuang) New Generalized Convexity and Their Applications (J. Kuang) Ternary biderivations and ternary bihomorphisms in $C^*$ ternary algebras (Park) Hyers Ulam stability of an additive quadratic functional equation (Park) Orthogonal Dirichlet Polynomials (S. Lubinsky) Generalizations and improvements of approximations of some analytic functions: a survey (Malešević) Some classes of Meir Keeler contractions (Gavruta) Interpolation of the Zech’s Logarithm – Explicit Forms (Rassias) Numerical calculations on multi photon processes in alkali metal vapors (Merlemis) General preinvex functions and variational like inequalities (A. Noor) A variational formulation of network games with random utility functions (Raciti) Fixed point theory in graph metric spaces (Petrusel) Approximate Solution of Fredholm Integral and Integro Differential Equations with Non Separable Kernels (E. Providas) Ordinary Super and Hyper Relators Can Be Used To Treat the Various Generalized Open Sets in a Unified Way (Szaz) Applications of Apostol type numbers and polynomials: Approach to techniques of computation algorithms in approximation and interpolation functions (Simsek) Spectra of signed graphs (Triantafillou) Perturbed Geometric Contractions in Ordered Metric Spaces (Turinici) On ${\\mathrm{G}}^{(\\sigma {\\textit{h}})}$ convexity of the functions and applications to Hermite Hadamards inequality (U. Awan). In recent years extensive research has been conducted by eminent mathematicians and engineers whose results and proposed problems are presented in this new volume. It is addressed to graduate students research mathematicians physicists and engineers. Individual contributions are devoted to topics of approximation theory functional equations and inequalities fixed point theory numerical analysis theory of wavelets convex analysis topology operator theory differential operators fractional integral operators integro differential equations ternary algebras super and hyper relators variational analysis discrete mathematics cryptography and a variety of applications in interdisciplinary topics. Several of these domains have a strong connection with both theories and problems of linear and nonlinear optimization. The combination of results from various domains provides the reader with a solid state of the art interdisciplinary reference to theory and problems. Some of the works provide guidelines for further research and proposals for new directions and open problems with relevant discussions.