If $*$ is a binary operation on a set $A$ having identity element $e\in A$, then an element $a\in A$ has an inverse in $A$ with respect to $*$ if there exists $a'\in A$ such that $$ a*a' = a'*a = e.$$
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- Review status: reviewed
- Last edited by Holly Swisher on 2019-04-26 14:09:07
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- 2019-04-26 14:09:07 by Holly Swisher (Reviewed)
- 2019-04-26 14:06:12 by Holly Swisher (Reviewed)
- 2018-08-06 02:23:25 by John Jones