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| | Identity (mathematics) - Wikipedia, the free encyclopedia |
 | | Alternatively, in algebra, an identity or identity element of a set S with a binary operation is an element e which combined with any element s of S produces s. |
 | | In mathematics, identity can refer to an equality that remains true regardless of the values of any variables that appear within it. |
 | | A common example of the third meaning is the identity permutation, which sends each element of the set { 1, 2,..., n } to itself. |
| en.wikipedia.org /wiki/Identity_(mathematics) (272 words) |
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