النظير والعنصر المحايد( The inverse and neutral element )

Описание: an identity element or neutral element of a binary operation is an element that leaves unchanged every element when the operation is applied.

The reciprocal for a number “a”, denoted by 1/a, is a number which when multiplied by “a” yields the multiplicative identity 1. The additive inverse of a number “a” is the number that when added to “a”, gives result zero.