set theory

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noun

the branch of mathematics that deals with relations between sets.

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His boss, whom he admires, is waiting to meet with him about the big project.

His boss, who he admires, is waiting to meet with him about the big project.

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Origin of set theory

First recorded in 1940–45

Words nearby set theory

sett, Settat, settecentesque, settee, setter, set theory, set the pace, set the record straight, set the scene for, set the table, set the wheels in motion

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use set theory in a sentence

For those ready to venture into a little set theory, read on.
Can You Bowl Three Strikes?|Zach Wissner-Gross|June 18, 2021|FiveThirtyEight
They are uncommitted to any set theory and are relatively free from local European feelings.
The Story of the Great War, Volume VII (of VIII)|Various

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