Let f: [0, 1] __> (0, 1) be the function defined by f(0) = 1/2 , f (1/n) = 1/(n+2) for any n E Z+ and f(x) = x otherwise. Prove that f is a bijection.
Added by Matthew P.
Step 1
First, we need to show that f is injective (one-to-one). Suppose f(x) = f(y) for some x, y in [0, 1]. We have the following cases: Case 1: x = 0. Then f(x) = 1/2, so f(y) = 1/2. Since f(y) = 1/2, we must have y = 0, so x = y. Case 2: x = 1/n for some n ∈ Z+. Show more…
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