Suppose that S is a semigroup with left identity and left inverse, prove that it is a group.
Well, since it is a semigroup, S already has the associativity property, but how do I show it has the right id and right inverse?
Thank you
Suppose that S is a semigroup with left identity and left inverse, prove that it is a group.
Well, since it is a semigroup, S already has the associativity property, but how do I show it has the right id and right inverse?
Thank you