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Lecture 1 - UH

Lecture 1 Section One-To-One Functions; InversesJiwen He1 One-To-One Definition of the One-To-One FunctionsWhat are One-To-One Functions? Geometric TestHorizontal Line Test If some horizontal line intersects the graph of the function more than once,then the function is not one-to-one. If no horizontal line intersects the graph of the function more than once,then the function is are One-To-One Functions? Algebraic TestDefinition functionfis said to beone-to-one(or injective) iff(x1) =f(x2) impliesx1= functionfis one-to-one if and only if x1, x2,x16=x2impliesf(x1)6=f(x2).1 Examples and Counter-ExamplesExamples3. f(x) = 3x 5 is 1-to-1. f(x) =x2is not 1-to-1. f(x) =x3is 1-to-1.

The graph of f−1 is the graph of f reflected in the line y = x. Example 13. Given the graph of f, sketch the graph of f−1. Solution First draw the line y = x. Then reflect the graph of f in that line. Corollary 14. f is continuous ⇒ so is f−1. 2.3 Differentiability of Inverses Differentiability of Inverses Theorem 15. (f−1)0(y ...

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