Условие:
Prove Proposition 2.2.14 (Strong principle of induction). Let m0 be a natural number, and let P(m) be a property pertaining to an arbitrary natural number m. Suppose that for each m ≥ m0, we have the following implication: if P(m′) is true for all natural numbers m0 ≤ m′ < m, then P(m) is also true. (In particular, this means that P(m0) is true, since in this case the hypothesis is vacuous.) Then we can conclude that P(m) is true for all natural numbers m ≥ m0.

