denumerable sets

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Prove the following statement using induction on n: if A1, . . . ,An are
denumerable sets, then the set of all n-tuples

{(a1, . . . , an} | ai belongs to Ai for i=1, . . . , n} is denumerable

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It would suffice if you just proved it for two sets, as then .

So, you need to show that the Cartesian product of two denumerable sets (infinite, in the interesting case) has the cardinality of . This is equivalent to finding a 1-1 mapping .

There's plenty of those. You try!