# set theory

set theory

**MLA Style**

"set theory." YourDictionary, n.d. Web. 15 July 2019. <https://www.yourdictionary.com/set-theory>.

**APA Style**

set theory. (n.d.). Retrieved July 15th, 2019, from https://www.yourdictionary.com/set-theory

## set theory

noun

*Mathematics*

**MLA Style**

"set theory." YourDictionary, n.d. Web. 15 July 2019. <https://www.yourdictionary.com/set-theory>.

**APA Style**

set theory. (n.d.). Retrieved July 15th, 2019, from https://www.yourdictionary.com/set-theory

**MLA Style**

"set theory." YourDictionary, n.d. Web. 15 July 2019. <https://www.yourdictionary.com/set-theory>.

**APA Style**

set theory. (n.d.). Retrieved July 15th, 2019, from https://www.yourdictionary.com/set-theory

## set theory - Computer Definition

The branch of mathematics or logic that is concerned with sets of objects and rules for their manipulation. UNION, INTERSECT and COMPLEMENT are its three primary operations and they are used in relational databases as follows. Given a file of Americans and a file of golfers, UNION would create a file of all Americans and golfers. INTERSECT would create a file of American golfers, and COMPLEMENT would create a file of golfers who are not Americans, or of Americans who are not golfers. See fuzzy logic.

**MLA Style**

"set theory." YourDictionary, n.d. Web. 15 July 2019. <https://www.yourdictionary.com/set-theory>.

**APA Style**

set theory. (n.d.). Retrieved July 15th, 2019, from https://www.yourdictionary.com/set-theory