In this exercise you are to prove some well-known facts about numbers as a way of demonstrating use of the WOP. Use the WOP to prove the following:
(a) If a > 0, then for every natural number n, an > 0,
(b) For all positive integers a and b, b ≠ a + b. (Hint: Suppose for some a there is b such that b = a + b. By the WOP, there is a smallest such that, for some b, b = a0 + b. Apply the WOP again.)
(c) is irrational.
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