Let G be a group and let H<=G with [G:H]=2 show that H normal subgroup of G
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Originally Posted by mathemanyak Let G be a group and let H<=G with [G:H]=2 show that H normal subgroup of G is a normal subgroup if and only if . Create the cosets . If then because partitions the set into two sets. If then and thus again because partitions the set into two sets.
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