恒こう等とう

noun, used as a prefix

identity

Mathematics prefix meaning 'identical' or 'identity', used in terms like 恒等式 (identity equation) and 恒等変換 (identity transformation).

• この式しきは恒こう等とう的てきに成なり立たつ。

  This equation holds identically.

• 恒こう等とう写しゃ像ぞうはすべての要よう素そを自じ分ぶん自じ身しんに写うつす。

  The identity mapping maps every element to itself.