単たん位い元げん

noun

identity element; neutral element

In algebra, the element of a set that leaves other elements unchanged under a binary operation. Common in group theory.

• 群ぐんの単たん位い元げんは、任にん意いの元げんとの演えん算ざんでその元げんを変かえない。

  The identity element of a group leaves any element unchanged under the operation.