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visits member for 5 years, 5 months
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2d
comment When does Vopěnka's principle hold?
What is $0^\sharp$? :-|
2d
comment unfolding as resolution
I've always associated that with blowups.
2d
comment Must an algebraic variety with trivial tangent bundle be an abelian variety?
What a beautiful theorem.
Apr
20
revised When is an algebra of commuting matrices (contained in one) generated by a single matrix?
deleted 1 character in body
Mar
29
comment dual basis of cohomology algebra
I will move your question to math.stackexchange.com
Mar
28
comment Are there any Algebraic Geometry Theorems that were proved using Combinatorics?
Mathematical truth has very few sources. Arithmetic is one, combinatorics is another. Most things have a genealogy which goes all the way to these true Adam and Eves, through a surprisingly short chain of begats.
Mar
24
awarded  Good Answer
Mar
17
awarded  Nice Answer
Mar
7
comment Hochschild cohomology of the skew group ring D(X)#G in the complex analytic case
It would probably be a good idea to tell us what $D(X)$ is.
Mar
7
comment Replacing functors by topologically or simplicially enriched functors
«Do you really care about Top?» is a great line :-)
Mar
4
awarded  Nice Answer
Mar
2
awarded  Disciplined
Feb
27
comment Defining the cup product in Ext using a Kunneth formula
I'd say that if you really know how to lift cocycles to chain maps in an example, you also know how to write down the diagonal map :-)
Feb
27
comment Defining the cup product in Ext using a Kunneth formula
Sometimes, yes (specially when you only need to compute a few products, rather than the whole thing) but the reduction ofmcup products to conputations in the derived category is not a reduction, as the Principle of Conservation of Difficulty kicks in.
Feb
15
awarded  Popular Question
Feb
12
comment space at the Planck scale
That naive attempt at combining the two ideas is way too naive!
Feb
5
awarded  Nice Answer
Jan
29
comment How many geometric structures on manifolds are there?
You should probably make explicit what makes your question different from «what are the coverings of linear Lie groups?» which is what the comments are converging to.
Jan
28
comment Categorical proof subgroups of free groups are free?
The same is true of free Lie algebras: they are those of global dimension 1.
Jan
23
comment Proofs without words
If you cannot tell the difference between a proof-tree and a proof without words in the tradition of, say, the AMM Monthly, then that is clearly a limitation of yours. I would rather you start a meta thread, or a blog, instead of further polluting this thread with what is clearly rather orthogonal chatter.