Let S be a subset of N such that (a) 2k E S for all kEN, and (b) if k E S and k 2: 2
Chapter 1, Problem 19(choose chapter or problem)
Let S be a subset of N such that (a) 2k E S for all kEN, and (b) if k E S and k 2: 2, then k - 1 E S. Prove that S = N. 2
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