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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.

Lecture 1 Section 7.1 One-To-One Functions; Inverses Jiwen He 1 One-To-One Functions 1.1 Definition of the One-To-One Functions What are One-To-One Functions? Geometric Test Horizontal Line Test • If some horizontal line intersects the graph of the function more than once, then the function is not one-to-one.

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