binary relation

Fetched 2026-10-26 (cache).

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Noun

1. {{lb|en|set theory|order theory|"on" a set A}} A [[subset]] of the [[Cartesian product]] <math>A \times A</math> (the set of [[ordered pair]]s (<math>a</math>, <math>b</math>) of [[element]]s of <math>A</math>, alternatively written as <math>A^2</math>).
2. {{lb|en|set theory|order theory|"on" or "between" sets A and B}} A [[subset]] of the [[Cartesian product]] <math>A \times B</math>.

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.