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Math Help - about cyclic group

  1. #1
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    about cyclic group

    how to prove:

    C_a * C_b is cyclic when a,b coprime
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  2. #2
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    Quote Originally Posted by szpengchao View Post
    how to prove:

    C_a * C_b is cyclic when a,b coprime
    Prove that (x,y) generates C_a\times C_b where x generates C_a and y generates C_b.
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