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identity element
i·den·ti·ty el·e·ment (plural i·den·ti·ty el·e·men·ts)


noun 
Definition:
 
set element that leaves others unchanged: an element of a mathematical set that leaves other elements unchanged when combined with them
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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