Give a careful proof of the proposition: If A is denumerable

Give a careful proof of the proposition: If A is denumerable

Give a careful proof of the proposition: If A is denumerable and B ~ A, then B is denumerable.(You must exhibit an explicit 1-1 correspondence N -> B.)
Given that A ∼ B that is A is isomorphic to B.Hence there is an isomorphismg:B→A.And given that A is denumerable. Hence there is a bijective function f suchthatf :: A → Nis bijective…

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