## Definitions

### from The American Heritage® Dictionary of the English Language, 4th Edition

- n. The element of a set of numbers that when combined with another number in a particular operation leaves that number unchanged. For example, 0 is the identity element under addition for the real numbers, since if a is any real number, a + 0 = 0 + a = a. Similarly, 1 is the identity element under multiplication for the real numbers, since a × 1 = 1 × a = a. Also called unity.

### from Wiktionary, Creative Commons Attribution/Share-Alike License

- n. A member of a structure which, when applied to any other element via a binary operation induces an identity mapping; more specifically, given an operation *, an element I is

### from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

- n. an operator that leaves unchanged the element on which it operates

## Etymologies

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## Examples

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## Comments

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