On the Wikipedia page for Kahler Differentials, under examples and basic facts - it is said that given two ring homomorphisms: $R \rightarrow S \rightarrow T$, there is a short exact sequence $\Omega_{S/R}\otimes_ST \rightarrow \Omega_{T/R} \rightarrow \Omega_{T/S} \rightarrow 0.$ Can someone give me any direction as to why such a sequence must exist?
2026-03-27 07:20:06.1774596006
Why must a short exact sequence of Kahler Differentials exist.
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