History of tag 07YI
Go back to the tag's page.
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changed the statement
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2017-04-11 |
04fef69 |
New macro: \Ext
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changed the statement
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2013-08-03 |
16be7e5 |
ll check: words starting with u, v, w, x, y, z, U, V, W, X, Y, or Z
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changed the statement
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2013-03-27 |
ba00249 |
New macro: \NL for naive cotangent complex
The naive cotangent complex is an important ingredient to several
topics discussed in the Stacks project. It deserves its own macro.
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assigned tag 07YI
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2012-07-03 |
3fe4cf9
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Tags: Added new tags
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changed the statement
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2012-07-03 |
65e41c9 |
Sharpen criterion openness versality
Just having a single map with two properties is enough...
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changed the statement
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2012-06-28 |
d82e033 |
Some material about obstruction theories
This includes the notion of a naive obstruction theory and a
proof that such a thing is good enough to give openness of
versality. This was introduced on the blog
http://math.columbia.edu/~dejong/wordpress/?p=2472
It is just working out what you would get if you actually had an
algebraic stack. It seems likely that Artin was motivated in
formulating his axioms by the idea that such a thing should
exist.
Hopefully we can use this to prove openness of versality for
some nice cases such as families of proper flat algebraic
spaces... We'll see.
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created statement with label example-key in artin.tex
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2012-06-25 |
8e77799 |
Infinitesimal defos + auts + obs
Just an introduction.
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