set theory

noun

the branch of mathematics that deals with relations between sets.

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Origin of set theory

First recorded in 1940–45

Words nearby set theory

set the record straight, set the scene for, set the table, set the wheels in motion, set the world on fire, set theory, set to, set to rights, set tongues wagging, set up, set up housekeeping
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012