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changed the proof 2016-03-15 77c32df
Move material on fitting ideals ealier
assigned tag 0ABB 2014-06-05 db48fc0
Tags: Added new tags
assigned tag 0ABB 2014-06-05 07b83c2
Revert "Tags: Added new tags"

This reverts commit 515802d4c5e34f6abc8561c7075500b916a686a4.

Reason: We should never add tags to a development branch!
assigned tag 0ABB 2014-06-05 515802d
Tags: Added new tags
created statement with label lemma-finite-flat-over-almost-dense-subscheme-addendum in more-groupoids.tex 2014-05-31 79de699
Finding invariant affine opens

Thanks to Angelo Vistoli for discussions

This somewhat long commit constructs invariant affine opens for
codimension 1 points on a finite groupoid. The method is a bit
convoluted. It is essentially a 2 step process where we first find a
dense open where the groupoid is flat and then we carefully glue on an
affine open of the codimension 1 points along the boundary.

We will apply this to prove that a Noetherian algebraic space is a
scheme away from codimension 2. To prove this one can simplify the
arguments in this commit a bit and we will put in a remark pointing this
out later on.