from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun algebra A member of a structure which, when applied to any other element via a
binary operationinduces an identitymapping; more specifically, given an operation *, an element I is
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun an operator that leaves unchanged the element on which it operates
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