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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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