Lemma 10.138.11. Let A \to B \to C be ring maps. Assume A \to C is surjective (so also B \to C is) and A \to B formally smooth. Denote I = \mathop{\mathrm{Ker}}(A \to C) and J = \mathop{\mathrm{Ker}}(B \to C). Then the sequence
of Lemma 10.134.7 is split exact.
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