Let A, B, C be nonempty sets and let f : AB, g: B → C be functions such that go f is bijective. Prove that g is injective if and only if f is surjective.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter3: Functions And Graphs
Section3.4: Definition Of Function
Problem 63E
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Let A, B, C be nonempty sets and let f : A → B, g: B → C be functions such that go f is bijective.
Prove that g is injective if and only if f is surjective.
Transcribed Image Text:Let A, B, C be nonempty sets and let f : A → B, g: B → C be functions such that go f is bijective. Prove that g is injective if and only if f is surjective.
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