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(formerly user "unknowngoogle", and for a very short time "red herring" but that was a red herring)
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awarded  Notable Question 
Nov 23 
reviewed  Approve suggested edit on Given a Levy Exponent find the jumpmeasure and drift 
Nov 21 
comment 
Notion of manifold curvature?
(I mean, isn't it the usual differential/jacobian?) 
Nov 21 
comment 
Notion of manifold curvature?
What do you mean by Fréchet derivative? 
Nov 21 
awarded  Favorite Question 
Nov 20 
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What is DAG and what has it to do with the ideas of Voevodsky?
Can we say that somehow all these notions of "geometry" are subsumed by Lurie's Higher algebra, Higher topos theory and Structured spaces (of each of which unfortunately I know nothing)? 
Nov 19 
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Is true that $[\frac{\hat{A}(\mathbb HP^m)} { \hat{M}(\mathbb HP^m) }]_{4m} = 0$?
What is $p$? Is it the total Pontryagin class? 
Nov 19 
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Take contraction wrt a vector field twice and define kernel mod image. Does that give anything interesting?
I haven't read the answers (yet) but it reminds me of the Koszul complex. 
Nov 18 
revised 
Take contraction wrt a vector field twice and define kernel mod image. Does that give anything interesting?
deleted 128 characters in body 
Nov 18 
comment 
Does the sequence tan(n) diverge?
Maybe you want to ask about the series $\Sigma \tan (n)$ ? 
Nov 18 
accepted  Relation between $BG$ in topology and in algebraic geometry 
Nov 18 
asked  Relation between $BG$ in topology and in algebraic geometry 
Nov 14 
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BiałynickiBirula theory for noncomplete varieties
@Dave Anderson: I found the second isomorphism on page 19 of this set of slides: mysite.science.uottawa.ca/jlema072/BorelMoore.pdf Probably, yes, what is denoted $H^{i}_{BM}$ should be compactly supported cohomology. 
Nov 13 
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BiałynickiBirula theory for noncomplete varieties
My previous comment is confusing. I've just looked up in some references that for $X$ a (real) smooth manifold we have the following version of Poincaré duality: $H_{i}^{BM}(X)\cong H^{ni}(X)$ and $H_{BM}^i(X)\cong H_{ni}(X)$ where $n = \dim X$. So there's just a 'reflection' in the degree. Checking on the example of $\mathbb{C}^{*}$ acting on $\mathbb{C}$ I would say that, yes, BB computes BM (co)homology (with the cells of complex dimension $i$ generating degree $2i$ BM (co)homology). 
Nov 13 
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BiałynickiBirula theory for noncomplete varieties
@Dave Anderson: Ok, so I'm probably confusing BM homology with BM cohomology? Say we work with rational coefficients. You claim $H^{i}_{BM}(X)\cong H^{i}(X)$ whether $X$ is compact or not. On the other hand, according to the Wikipedia entry on BM homology, we would have $H_{i}^{BM}(\mathbb{C}^n)=\mathbb{Q}$ for $i=2n$ and trivial otherwise; while for ordinary homology $H_{i}(\mathbb{C}^n)=0$ (in positive degree) for the contractible space $\mathbb{C}^n$. This would suggest that in general $H_{i}^{BM}(X)\ncong H_{BM}^{i}$ as rational vector spaces? 
Nov 13 
revised 
BiałynickiBirula theory for noncomplete varieties
added 509 characters in body 
Nov 13 
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BiałynickiBirula theory for noncomplete varieties
@Ricardo Andrade: Ok, I'll edit accordingly. 
Nov 13 
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BiałynickiBirula theory for noncomplete varieties
A question: when you talk about BB cells computing cohomology, do you mean singular cohomology or BorelMoore homology (since we're on a noncompact manifold)? 
Nov 13 
accepted  BiałynickiBirula theory for noncomplete varieties 
Nov 13 
comment 
BiałynickiBirula theory for noncomplete varieties
Thank you for the detailed answer! 