2. Suppose f : X →Y and g : Y → Z are functions, and g of :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 gof is injective, implies that g is injective.

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter7: Distance And Approximation
Section7.4: The Singular Value Decomposition
Problem 53EQ
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2. Suppose f : X →Y and g : Y → Z are functions, and g of :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 gof is injective, implies that
g is injective.
Transcribed Image Text:2. Suppose f : X →Y and g : Y → Z are functions, and g of :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 gof is injective, implies that g is injective.
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