Integers. Sequences. The Induction Principle
Part of the Universitext book series (UTX)
Evidently there are some subsets S of ℝ which have the following properties.
1 ∈ S.
For each x in ℝ, x ∈ S ⇒ x+1 ∈ S.
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© Springer-Verlag New York, Inc. 1982