出典:Wiktionary
identity element (複数形 identity elements)
For binary operation defined on a given algebraic structure, an element is:
Where a given structure is equipped with an operation called addition, the notation may be used for the additive identity. Similarly, the notation denotes a multiplicative identity.
出典:Wikipedia
出典:『Wikipedia』 (2011/05/09 16:26 UTC 版)
In mathematics, an identity element (or neutral element) is a special type of element of a set with respect to a binary operation on that set. It leaves other elements unchanged when combined with them. This is used for groups and related concepts.