Let $A,B,C,D$ be R-modules. Suppose there is a commutative diagram as the following.
$A\to B$ is the injective, $A\to C$ and $B\to D$ are surjective.
Is $C\to D$ injective?
2026-03-25 09:31:40.1774431100
commutative diagram with one injective map
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