Creating a composite function that is injective with an injective and a non-injective part – math.stackexchange.com

Creating a composite function that is injective with an injective and a non-injective part – math.stackexchange.com

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Find an example of functions $f:A\to B$ and $g:B\to C$ such that $f$ and $g\circ f$ are both injective, but $g$ is not injective. So If I understand this correctly, Need a function $f$ that is ...

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