Lemma 15. If n ∈ N then 0 · n = 0. Lemma 16. If n ∈ N then 1 · n = n. Exercise 28. Prove the above two lemmas using the induction axiom.

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Lemma 15. If n ∈ N then 0 · n = 0.

Lemma 16. If n ∈ N then 1 · n = n.

Exercise 28. Prove the above two lemmas using the induction axiom.

Expert Solution
Lemma 15.

If n ∈ N then 0 · n = 0.

Base case: For n = 1, 0 · 1 = 0,

Induction Hypothesis: Assume that the above result holds true for all positive integers less than or equal to n, then

Inductive step: We have to prove that the result holds true for n:= n + 1,

So now, for n:= n + 1

0 · (n + 1) = 0 · n + 0 · 1 = 0 + 0 = 0 by using Induction Hypothesis and the base case.

Thus, we proved the result for n:= n + 1 which implies that 0 · n = 0 for every n ∈ N by using principle of mathematical induction. 

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