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Semi Group
09-14-2010, 12:09 PM
Post: #1
Semi Group
(1) Show that semigroup $(S, \cdot)$ is a group if $\exists e_r \in S \; \forall a\in S \; \exists a_r^{-1}\in S \;(a\cdot e_r = a, \; a\cdot a_r^{-1} = e_r)$
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