If G is a group, then (a^-1)^-1=a for all a in G.

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Theorems in Group Theory
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WAALEKUM SALAM WARAMOTULLAHI WABARAKATUHU

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hello Mr. Bismillah ji...mere ko kuch samaj ni aaya khuda kasam ye channel band kar aur Aata bhejwa du? agar koi dikkat na ho to

AdarshKumar-mpom