from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An element that in a given mathematical system leaves unchanged any element to which it is added.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An element of an algebraic structure, generally denoted 0, which is an identity for an additive operation (generally denoted +). That is, x + 0 = 0 + x = x for any x in the structure.
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