3-part question: Suppose f: X --> Y and g: Y --> Z are functions, and g of f: X --> Z is injective.  (a) Show that f is injective. (b) Provide an example where f is not injective.  (c) Impose a condition on f so that it, together with the assumption that g of f is injective, implies that g is injective.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter3: Functions And Graphs
Section3.5: Graphs Of Functions
Problem 42E
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3-part question: Suppose f: X --> Y and g: Y --> Z are functions, and g of f: X --> Z is injective. 

(a) Show that f is injective.

(b) Provide an example where f is not injective. 

(c) Impose a condition on f so that it, together with the assumption that g of f is injective, implies that g is injective. 

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