Given two functions:(adsbygoogle = window.adsbygoogle || []).push({});

f:A --> B

g:B --> C

How to show that if the (g ° f) is injection, then f is injection?

I tried this:

We need to show that g(f(a)) = g(f(b)) ==> a = b holds true for all a, b in A. But there's nothing said about function g.

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# Homework Help: Injective Compositition

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