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The Stacks project

History of tag 042J

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changed the statement 2015-02-10 5633bed
Corrections in sets.tex and categories.tex

Thanks to Wouter Zomervrucht
changed the statement 2010-07-16 d5b7bec
Relative inertia fibred category

	We pay for not introducing relative inertia fibred categories by
	having to do it all over again.
assigned tag 042J 2010-01-25 cccc58a
Tags: added new tags
created statement with label lemma-characterize-fibred-setoids-inertia in categories.tex 2010-01-20 0436365
Algebraic stacks: Deligne-Mumford with trivial inertia is a space

	To prove this for a general algebraic stack we will first prove
	a characterization of a DM stack as an algebraic stack whose
	inertia is formally unramified, or equivalently diagonal is
	formally unramified. Before we do this it makes sense to change
	the notion of unramified as suggested by David Rydh (see
	documentation/todo-list).

	We also added the proof of the statement that the property of
	being an algebraic stack is invariant under equivalences.