SET THEORY Definition & Meaning

set theory

noun

the branch of mathematics that deals with relations between sets.

set theory

noun

maths the branch of mathematics concerned with the properties and interrelationships of sets
logic a theory constructed within first-order logic that yields the mathematical theory of classes, esp one that distinguishes sets from proper classes as a means of avoiding certain paradoxes

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51�Թ� History and Origins

Origin of set theory¹

First recorded in 1940–45

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Example Sentences

Examples have not been reviewed.

Which extended version of set theory will prevail, if any, remains to be seen.

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It would be little comfort to Cantor that his work was the foundation of a whole new branch of mathematics: set theory.

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Causal set theory, another contender for a theory of quantum gravity, posits that space and time are made of more fundamental components as well.

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There are many different ways to construct the disjoint union using the axioms of set theory, which will not produce exactly the same set but will, necessarily, produce isomorphic ones.

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In the late 1800s, German logician Georg Cantor, founder of modern set theory, discovered that not all infinite sets are equal.

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