恒こう等とう関かん係けい

noun

identity relation

A mathematical term for a relation where every element is related only to itself. Used in set theory and logic.

• 集しゅう合ごうA上じょうの恒こう等とう関かん係けいは、各かく要よう素そが自じ分ぶん自じ身しんとのみ関かん係けいを持もつ。

  The identity relation on set A is such that each element is related only to itself.