Prove that a set T1 is denumerable if and only if there is a bijection from T1 onto a denumerable set T2
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Prove that a set T1 is denumerable if and only if there is a bijection from T1 onto a denumerable set T2
I assume a denumerable set is one that has a bijection onto the set of natural numbers. In this case, recall that a composition of two bijections is again a bijection.
