MATH 1023 Chapter : Section 3 6R2R

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15 Mar 2019
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Definition: a function with domain a is called a one-to-one function if no two elements of a have the same image, that is, f(x1) f(x2) whenever x1 x2. Determining whether a function is one-to-one using the. A function is one-to-one if a horizontal line intersects its graph in at most one point. Note: if a function is always increasing or decreasing, then it is one-to-one. Example 1: determine whether the function is one-to-one. xf x xf. 3 x xf x xf x f -1(y)=x f(x)=y for any y in b. Note: if a function is one-to-one, then it can have an inverse. Definition: let f be a one-to-one function with domain a and range b. Then its inverse function f -1 has domain b and range a and is defined by. Property: let f be a one-to-one function with domain a and range b.

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