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  3. prove a (dedekind) set is infinite iff there e

Prove a (Dedekind) set is infinite iff there exists an injective function f : N→ A. please...

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Advance Math

Prove a (Dedekind) set is infinite iff there exists an injectivefunction f : N→ A.

please help prove this clearly and i will rate the best answerthank you

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