Let G be a group. Prove that G is abelian if and only if (ab)^-1 = a^-1 * b^-1 for all a,b in G.

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- October 8th 2009, 07:38 PMelninioProve G is abelian iff...
Let G be a group. Prove that G is abelian if and only if (ab)^-1 = a^-1 * b^-1 for all a,b in G.

- October 8th 2009, 09:49 PMGamma