set theory
noun
the branch of mathematics that deals with relations between sets.
Origin of set theory
First recorded in 1940–45
Words nearby set theory
British Dictionary definitions for set theory
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