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- Find the normalizer of the subgroup (1),(1,3)(2,4) of the octic group D4.Exercises 3. Find an isomorphism from the additive group to the multiplicative group of units . Sec. 16. For an integer , let , the group of units in – that is, the set of all in that have multiplicative inverses, Prove that is a group with respect to multiplication.Prove or disprove that H={ hGh1=h } is a subgroup of the group G if G is abelian.