how to prove: C_a * C_b is cyclic when a,b coprime
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Originally Posted by szpengchao how to prove: C_a * C_b is cyclic when a,b coprime Prove that $\displaystyle (x,y)$ generates $\displaystyle C_a\times C_b$ where $\displaystyle x$ generates $\displaystyle C_a$ and $\displaystyle y$ generates $\displaystyle C_b$.
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