Integers. Sequences. The Induction Principle

@inproceedings{Moise1982IntegersST,
  title={Integers. Sequences. The Induction Principle},
  author={Edwin E. Moise},
  year={1982}
}
Evidently there are some subsets S of ℝ which have the following properties. (1) 1 ∈ S. (2) For each x in ℝ, x ∈ S ⇒ x+1 ∈ S. 

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