Prove that S = {z|zC and |z| = 0 or |z| = 1/n for nN) is closed in C.
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Originally Posted by grad444 Prove that S = {z|zC and |z| = 0 or |z| = 1/n for nN) is closed in C. 1) Find the boundary of this set. 2) Show the boundary lies in this set.
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