Georg Ferdinand Ludwig Philipp Cantor ( ; ] ; March 3 [O.S. February 19] 1845  – January 6, 1918) was a German mathematician.
 He invented set theory, which has become a fundamental theory in mathematics.
 Cantor established the importance of one-to-one correspondence between the members of two sets, defined infinite and well-ordered sets, and proved that the real numbers are more numerous than the natural numbers.
 In fact, Cantor's method of proof of this theorem implies the existence of an "infinity of infinities".
 He defined the cardinal and ordinal numbers and their arithmetic.
 Cantor's work is of great philosophical interest, a fact of which he was well aware.
The napkin folding problem is a problem in geometry and the mathematics of paper folding that explores whether folding a square or a rectangular napkin can increase its perimeter.
 The problem is known under several names, including the Margulis napkin problem, suggesting it is due to Grigory Margulis, and the Arnold's rouble problem referring to Vladimir Arnold and the folding of a Russian ruble bank note.
 Some versions of the problem were solved by Robert J. Lang, Svetlana Krat, Alexey S. Tarasov, and Ivan Yaschenko.
 One form of the problem remains open.
In differential geometry, a subfield of mathematics, the Margulis lemma (named after Grigory Margulis) is a result about discrete subgroups of isometries of a non-positively curved Riemannian manifolds (e.g. the hyperbolic n-space).
 Roughly, it states that within a fixed radius, usually called the Margulis constant, the structure of the orbits of such a group cannot be too complicated.
 More precisely, within this radius around a point all points in its orbit are in fact in the orbit of a nilpotent subgroup (in fact a bounded finite number of such).
The Cantor medal of the Deutsche Mathematiker-Vereinigung is named in honor of Georg Cantor, the first president of the DMV.
 It is awarded at most every second year during the yearly meetings of the society.
 The prize winners are mathematicians who are associated with the German language.
In mathematics, a Jónsson–Tarski algebra or Cantor algebra is an algebraic structure encoding a bijection from an infinite set "X" onto the product "X"×"X".
 They were introduced by .
 , named them after Georg Cantor because of Cantor's pairing function and Cantor's theorem that an infinite set "X" has the same number of elements as "X"×"X"; the term "Cantor algebra" is also occasionally used to mean the Boolean algebra of all clopen subsets of the Cantor set, or the Boolean algebra of Borel subsets of the reals modulo meager sets (sometimes called the Cohen algebra).
Gregori Aleksandrovich Margulis (Russian: Григо́рий Алекса́ндрович Маргу́лис , first name often given as Gregory, Grigori or Grigory; born February 24, 1946) is a Russian-American mathematician known for his work on lattices in Lie groups, and the introduction of methods from ergodic theory into diophantine approximation.
 He was awarded a Fields Medal in 1978 and a Wolf Prize in Mathematics in 2005, becoming the seventh mathematician to receive both prizes.
 In 1991, he joined the faculty of Yale University, where he is currently the Erastus L. De Forest Professor of Mathematics.
In mathematics, a Cantor space, named for Georg Cantor, is a topological abstraction of the classical Cantor set: a topological space is a Cantor space if it is homeomorphic to the Cantor set.
 In set theory, the topological space 2 is called "the" Cantor space.
 Note that, commonly, 2 is referred to simply as the Cantor set, while the term Cantor space is reserved for the more general construction of "D" for a finite set "D" and a set "S" which might be finite, countable or possibly uncountable.
Rational trigonometry is a proposed reformulation of metrical planar and solid geometries (which includes trigonometry) by Canadian mathematician Norman J. Wildberger, currently an associate professor of mathematics at the University of New South Wales.
 His ideas are set out in his 2005 book "Divine Proportions: Rational Trigonometry to Universal Geometry".
 According to "New Scientist", part of his motivation for an alternative to traditional trigonometry was to avoid some problems that occur when infinite series are used in mathematics.
 Rational trigonometry avoids direct use of transcendental functions like sine and cosine by substituting their squared equivalents.
 Wildberger draws inspiration from mathematicians predating Georg Cantor's infinite set-theory, like Gauss and Euclid, who he claims were far more wary of using infinite sets than modern mathematicians.
 To date, rational trigonometry is largely unmentioned in mainstream mathematical literature.
In topology, a branch of mathematics, the Knaster–Kuratowski fan (named after Polish mathematicians Bronisław Knaster and Kazimierz Kuratowski) is a specific connected topological space with the property that the removal of a single point makes it totally disconnected.
 It is also known as Cantor's leaky tent or Cantor's teepee (after Georg Cantor), depending on the presence or absence of the apex.
In mathematics, the Smith–Volterra–Cantor set (SVC), fat Cantor set, or ε-Cantor set is an example of a set of points on the real line ℝ that is nowhere dense (in particular it contains no intervals), yet has positive measure.
 The Smith–Volterra–Cantor set is named after the mathematicians Henry Smith, Vito Volterra and Georg Cantor.
 The Smith-Volterra-Cantor set is topologically equivalent to the middle-thirds Cantor set.

Question: Which of these mathematicians was born at an earlier date, Georg Cantor or Grigory Margulis?
Answer: Georg Ferdinand Ludwig Philipp Cantor