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Set theory is the branch of mathematical logic that studies sets, which can be informally described as collections of objects. Although objects of any kind can be collected into a set, set theory — as a branch of mathematics — is mostly concerned with those that are relevant to mathematics as a whole. The modern study of set theory was ...
Georg Ferdinand Ludwig Philipp Cantor (/ ˈkæntɔːr / KAN-tor; German: [ˈɡeːɔʁk ˈfɛʁdinant ˈluːtvɪç ˈfiːlɪp ˈkantoːɐ̯]; 3 March [O.S. 19 February] 1845 – 6 January 1918 [1]) was a mathematician who played a pivotal role in the creation of set theory, which has become a fundamental theory in mathematics. Cantor established ...
Apr 10, 2007 · 4. From Zermelo to Gödel. In the period 1900–1930, the rubric “set theory” was still understood to include topics in topology and the theory of functions. Although Cantor, Dedekind, and Zermelo had left that stage behind to concentrate on pure set theory, for mathematicians at large this would still take a long time.
Throughout the 1880s and 1890s, he refined his set theory, defining well-ordered sets and power sets and introducing the concepts of ordinality and cardinality and the arithmetic of infinite sets. What is now known as Cantor’s theorem states generally that, for any set A, the power set of A(i.e. the set of all subsets of A) has a strictly ...
one-to-one correspondence. set theory. transfinite number. (Show more) Georg Cantor (born March 3, 1845, St. Petersburg, Russia—died January 6, 1918, Halle, Germany) was a German mathematician who founded set theory and introduced the mathematically meaningful concept of transfinite numbers, indefinitely large but distinct from one another.
- The Editors of Encyclopaedia Britannica
Summary. Georg Cantor was a Russian-born mathematician who can be considered as the founder of set theory and introduced the concept of infinite numbers with his discovery of cardinal numbers. He also advanced the study of trigonometric series. View five larger pictures.
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History of logic - Set Theory, Symbolic Logic, Aristotle: With the exception of its first-order fragment, the intricate theory of Principia Mathematica was too complicated for mathematicians to use as a tool of reasoning in their work. Instead, they came to rely nearly exclusively on set theory in its axiomatized form. In this use, set theory serves not only as a theory of infinite sets and of ...
