identity element

identity element

noun Mathematics.
identity (def. 9b).

Origin:
1900–05
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Identity element is always a great word to know.
So is subtract. Does it mean:
to take one number or quantity from another; deduct
a proportion containing terms of which an increase in one results in a decrease in another
American Heritage
Science Dictionary
identity element   (ī-děn'tĭ-tē)  Pronunciation Key 
The element of a set of numbers that when combined with another number under a particular binary operation leaves the second number unchanged. For example, 0 is the identity element under addition for the real numbers, since for any real number a, a + 0 = a, and 1 is the identity element under multiplication for the real numbers, since a × 1 = a.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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