233 Mathematical Induction
by EngliSea on 2020-07-15
Let P(n) be a statement for each natural number n. If
(a) P(1) is true, and
(b) P(k) true ⇒ P(k+1) true for every natural number k∈ℕ
then P(n) is true for all n∈ℕ.