Question: Which mathematician was German, Georg Cantor or Alexander Kronrod?

Context articles: Georg Cantor
Jónsson–Tarski algebra
Infinity (philosophy)
Alexander Kronrod
Limitation of size
Smith–Volterra–Cantor set
Tav (number)
Cantor set
Cantor space
Georg Cantor's first set theory article

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.
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).
In philosophy and theology, infinity is explored in articles under headings such as the Ultimate, the Absolute, God, and Zeno's paradoxes.
 In Greek philosophy, for example in Anaximander, 'the Boundless' is the origin of all that is.
 He took the beginning or first principle to be an endless, unlimited primordial mass (ἄπειρον, "apeiron").
 The Jain metaphysics and mathematics was the first to define and delineate different "types" of infinities.
 The work of the mathematician Georg Cantor first placed infinity into a coherent mathematical framework.
 Keenly aware of his departure from traditional wisdom, Cantor also presented a comprehensive historical and philosophical discussion of infinity.
 In Judeo-Christian theology, for example in the work of Duns Scotus, the infinite nature of God invokes a sense of being without constraint, rather than a sense of being unlimited in quantity.
 In ethics infinity plays an important role designating that which cannot be defined or reduced to knowledge or power.
Aleksandr (Alexander) Semenovich Kronrod (Russian: Алекса́ндр Семёнович Кронро́д ) (October 22, 1921 – October 6, 1986) was a Soviet mathematician and computer scientist, best known for the Gauss-Kronrod quadrature formula which he published in 1964.
 Earlier, he worked on computational solutions of problems emerging in theoretical physics.
 He is also known for his contributions to economics, specifically for proposing corrections and calculating price formation for the USSR.
 Later, Kronrod gave his fortune and life to medicine to care for terminal cancer patients.
 Kronrod is remembered for his captivating personality and was admired as a student, teacher and leader.
In the philosophy of mathematics, specifically the philosophical foundations of set theory, limitation of size is a concept developed by Philip Jourdain and/or Georg Cantor to avoid Cantor's paradox.
 It identifies certain "inconsistent multiplicities", in Cantor's terminology, that cannot be sets because they are "too large".
 In modern terminology these are called proper classes.
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.
In his work on set theory, Georg Cantor denoted the collection of all cardinal numbers by the last letter of the Hebrew alphabet, ת (transliterated as Taf, Tav, or Taw.)
 As Cantor realized, this collection could not itself have a cardinality, as this would lead to a paradox of the Burali-Forti type.
 Cantor instead said that it was an "inconsistent" collection which was absolutely infinite.
In mathematics, the Cantor set is a set of points lying on a single line segment that has a number of remarkable and deep properties.
 It was discovered in 1874 by Henry John Stephen Smith and introduced by German mathematician Georg Cantor in 1883.
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.
Georg Cantor's first set theory article was published in 1874 and contains the first theorems of transfinite set theory, which studies infinite sets and their properties.
 One of these theorems is "Cantor's revolutionary discovery" that the set of all real numbers is uncountably, rather than countably, infinite.
 This theorem is proved using Cantor's first uncountability proof, which differs from the more familiar proof using his diagonal argument.
 The title of the article, "On a Property of the Collection of All Real Algebraic Numbers" ("Ueber eine Eigenschaft des Inbegriffes aller reellen algebraischen Zahlen "), refers to its first theorem: the set of real algebraic numbers is countable.