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Math Help - Complex Analysis

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    Complex Analysis

    Prove that S = {z|zC and |z| = 0 or |z| = 1/n for nN) is closed in C.
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    Quote Originally Posted by grad444 View Post
    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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