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changed the statement 2017-04-13 e78cf8c
Fix an index in algebra

Thanks to Dario Weissman
http://stacks.math.columbia.edu/tag/080U#comment-2472
assigned tag 080U 2012-07-25 5559256
Tags: Added new tags
created statement with label lemma-blowup-in-principal in algebra.tex 2012-07-24 7835fb9
Flattening by blowing up

Still a bit rough, but the arguments are all there.
A fun lemma is that the problem is etale local on the base.
The rest is exactly as in Raynaud-Gruson (the lemma may
be there too, I'm not sure).