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changed the proof 2014-03-25 642f650
Fix definition of fppf covering in spaces-topologies.tex

Thanks to Kestutis Cesnavicius. We should add a lot more material to the
sections of this chapter parallel to the material in topologies.tex
assigned tag 0469 2010-01-29 49580f9
Tags: added new tags
created statement with label lemma-fppf-covering-surjective in spaces-topologies.tex 2010-01-27 3d8ebf6
Restriction and equivalences

	We inserted a couple of lemmas describing when the restriction
	of a groupoid scheme gives rise to an isomorphic quotient sheaf
	or when it gives rise to an equivalent quotient stack.