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The Stacks project

History of tag 06PH

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type time link
changed the statement and the proof 2023-01-16 9c2bdc6
Quotient by free action is a torsor

Thanks to Janos Kollar for asking the question
changed the statement 2015-03-12 473f075
Fix notation in bootstrap.tex

Thanks to Kestutis Cesnavicius
http://stacks.math.columbia.edu/tag/06PH#comment-1323
changed the proof 2013-08-03 4f3d6a1
Spell check: words starting with a or A
assigned tag 06PH 2011-06-15 2aa1b6c
Tags: Added new tags
created statement with label lemma-quotient-free-action in bootstrap.tex 2011-06-15 0825897
Big set of changes

	Most of this is geared towards proving (in the "correct" way)
	that an algebraic stack is a gerbe if and only if the inertia is
	flat and locally of finite presentation over it.

	Other additions are:
		stackification and inertia
		[U/G] ---> U/G in the case of free actions
		residual gerbes are gerbes (not nec over a point!)
		presentations of inertia stacks
		definition free action
		U ---> U/R is flat + lfp in final bootstrap theorem