In mathematics, if G is a group, and H is a subgroup of G, and g is an element of G, thengH = { gh : h an element of H } is the left coset of H in G with respect to g, andHg = { hg : h an element of H } is the right coset of H in G with respect to g.Only when H is normal will the set of right cosets and the set of left cosets of H coincide, which is one definition of normality of a subgroup.
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