Consider G = {zЄ C: z = 1} Prove that G is a subgroup of C* the group of non- zero complex numbers with respect to multiplication.
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- 12. Consider the mapping defined by . Decide whether is a homomorphism, and justify your decision.41. Let be a cyclic group, . Prove that is abelian.In Exercises 114, decide whether each of the given sets is a group with respect to the indicated operation. If it is not a group, state a condition in Definition 3.1 that fails to hold. The set of all complex numbers x that have absolute value 1, with operation addition. Recall that the absolute value of a complex number x written in the form x=a+bi, with a and b real, is given by | x |=| a+bi |=a2+b2