Let G be a group and H be a non-empty subset of G. Then H is subgroup of G iff ab^(-1)∈H ∀a, b∈H.

In this lecture, we show that H is subgroup of G iff ab^(-1)∈H ∀a, b∈H, where H is a non-empty subset of G. ‪@AmitKumar-cg7be‬
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