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An identity element is that element of a set of [[number|numbers]] which, when combined with another number in a particular operation, leaves that number unchanged.
An identity element is that element of a set of [[number]]s which, when combined with another number in a particular operation, leaves that number unchanged.
Zero (0) is the identity element under addition for the [[real numbers]]. If a is any real number, a + 0 = a and 0 + a = a.
Zero (0) is the identity element under addition for the [[real numbers]]. If a is any real number, a + 0 = a and 0 + a = a.