Mathematics, 14.09.2019 02:30 bre644

Let s be a semigroup. prove that s is a group if and only if for all a, b ∈ g, the equations ax = b and ya = b have solutions in s.

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Let s be a semigroup. prove that s is a group if and only if for all a, b ∈ g, the equations ax = b...

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