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Nov 27, 2011 at 17:35 comment added Martin Brandenburg Thanks Angelo! I have no idea why I didn't see this obvious proof, especially after having written down the same for faithfully flat $R \to S$.
Nov 27, 2011 at 17:18 vote accept Martin Brandenburg
Nov 27, 2011 at 17:17 vote accept Martin Brandenburg
Nov 27, 2011 at 17:17
Nov 27, 2011 at 17:06 history answered Angelo CC BY-SA 3.0