noun

A pair of numbers that come in a specific order and are usually written in parentheses, such as (3, 5).

noun

A pair of numbers that come in a specific order and are usually written in parentheses, such as (3, 5).

THE AMERICAN HERITAGE® DICTIONARY OF THE ENGLISH LANGUAGE, FIFTH EDITION by the Editors of the American Heritage Dictionaries. Copyright © 2016, 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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**MLA Style**

"Ordered pair." *YourDictionary*. LoveToKnow. www.yourdictionary.com/ordered-pair.

**APA Style**

Ordered pair. (n.d.). In *YourDictionary*. Retrieved from https://www.yourdictionary.com/ordered-pair

Noun

(*plural* ordered pairs)

- (set theory) An object containing exactly two elements in a fixed order, so that, when the elements are different, exchanging them gives a different object. Notation: (a, b)
*or*.- If an
**ordered pair**were defined (in terms of sets) as then the "first element" of an ordered pair*S*could be defined as CAR(S) where CAR(S) =*x*if and only if . Likewise, the "second element" of*S*could be defined as CDR(S) where CDR(S) =*x*if and only if . If the two elements happened to be equal, then the ordered pair would still have cardinality two as would be naturally expected.

- If an

English Wiktionary. Available under CC-BY-SA license.

Link to this page

Cite this page

**MLA Style**

"Ordered pair." *YourDictionary*. LoveToKnow. www.yourdictionary.com/ordered-pair.

**APA Style**

Ordered pair. (n.d.). In *YourDictionary*. Retrieved from https://www.yourdictionary.com/ordered-pair