Question: Hello i need help solving this proof attached below thank you! 1) A set A is infinite iff for every new there is injective function

Hello i need help solving this proof attached below thank you!

1) A set A is infinite iff for every new there is injective function f : In] - A . 2 ) prop 1 3. 1!; Every inbrite set contains ( as a subset ) a countably infinite set

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