set-theory

set theory

noun
the branch of mathematics that deals with relations between sets.

Origin:
1940–45

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World English Dictionary
set theory
 
n
1.  maths the branch of mathematics concerned with the properties and interrelationships of sets
2.  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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