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changed the proof 2011-06-15 78133d1
Fixed references to short titles

	using the script we will add in the next commit
assigned tag 06PK 2011-06-15 2aa1b6c
Tags: Added new tags
created statement with label lemma-group-quotient-algebraic in criteria.tex 2011-06-13 1e271f0
Criteria for quotient stacks to be algebraic

	The most interesting result is that [S/G] is an algebraic stack
	if and only if G ---> S is flat and locally of finite
	presentation. The proof uses a fun lemma on the descent of
	flatness (see the change in descent.tex).