MAT102H5 Study Guide - Quiz Guide: Bounded Set, Surjective Function

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2 Jan 2019
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MAT102H5 Full Course Notes
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Mat102f - introduction to mathematical proofs - utm - fall 2018. Solutions to selected problems from problem set i. 5. 6. 13 choose x, y r such that f (x) = f (y). Consequently, 0 5|x y| 0, and |x y| = 0. 0 = |f (x) f (y)| 5|x y|. 5. 6. 15 (b) let us show that g is injective. Consider x1, x2 a, x1 6= x2. We are given that x1 = f (g(x1)) and x2 = f (g(x2)). It follows that f (g(x1)) 6= f (g(x2)). Let us show that g is surjective, that is, g(b) = a. Then x = g(f (x)) where f (x) b. Moreover, y = f (x) if and only if g(y) = x. 5. 6. 21 base case: n = 1, f (x) = x x + 1. 1 + kx for some k. consider f k+1(x) = f (f k(x)) = f k(x) 5. 6. 23 (a) true since f (r) = r (unbounded set). (b) false.

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