Assume: $c$ divides $ab$ and $GCD(a,c)=1$. Calculate $GCD(b,c)$.I think that $GCD(b,c)=c$ But how to prove it. Help me, please.
I have injection $f \colon A \rightarrow B$ and I want to get bijection. Can I just resting codomain to $f(A)$? I know that every function i...
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