Question: Let A be an infinite subset of N. Prove that f: A N defined by f(a) = {b A: b a}| is a bijection,

Let A be an infinite subset of N. Prove that f: A 

Let A be an infinite subset of N. Prove that f: A N defined by f(a) = {b A: b a}| is a bijection, and conclude that [A] = No.

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