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changed the statement and the proof 2020-12-16 33d61d4
Improve a lemma in morphisms

Thanks to Laurent Moret-Bailly
https://stacks.math.columbia.edu/tag/04PW#comment-5820
assigned tag 04PW 2010-06-02 90566d1
Added new tags
created statement with label lemma-characterize-flat-closed-immersions in morphisms.tex 2010-06-02 5975a10
Flat closed immersions

	These cut out exactly the closed subsets stable under
	generalization. This gives us a way of defining a canonical
	closed subscheme structure on connected components.