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Functional relation

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This is an old revision of this page, as edited by Michael Hardy (talk | contribs) at 02:59, 29 August 2007 (a small amount of cleanup; more is needed. This article neglects Wikipedia:Manual of Style and Wikipedia:Manual of Style (mathematics) and lacks initial context-setting.). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

A functional relation is:

(x)(xX) & (y)(z)(y,zY)((Rxy & Rxz) y = z)

The relation R is functional over X and Y.

A binary relation that is functional is called a partial function

A binary relation that is total and functional is called a function

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