Grigory M

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Jan
20
 comment Cohomology ring $H^*(\mathbb{R}P^3 \# \mathbb{R}P^3; \mathbb{Z}_2)$.
possible duplicate of computing cohomology algebra of connected sum of two real projective spaces
Jan
20
 revised computing cohomology algebra of connected sum of two real projective spaces
edited tags
Jan
20
 revised Cohomology ring $H^*(\mathbb{R}P^3 \# \mathbb{R}P^3; \mathbb{Z}_2)$.
edited tags
Jan
19
 awarded  Fanatic
Jan
17
 comment Which cohomology theories have a formula $\langle \Omega,\text d \omega \rangle = \langle \partial \Omega,\omega \rangle$?
@NickKidman There is standard definition of extraordinary (co)homology theory (Eilenberg-Steenrod axioms). If you mean something else -- what exactly?
Jan
17
 revised Morita equivalence of acyclic categories
edited tags
Jan
16
 comment Which cohomology theories have a formula $\langle \Omega,\text d \omega \rangle = \langle \partial \Omega,\omega \rangle$?
Do you mean in extraordinary cohomology theories?
Jan
15
 comment Cup product of cohomology and the Kunneth formula
But this doesn't quite answers the question, right? (Embarassingly, I'm not sure I know the whole answer for cohomology over $\mathbb Z$, actually.)
Jan
15
 answered $n$-skeleta of a CW-complex and the cup product
Jan
15
 revised Spaces with equal homotopy groups but different homology groups?
edited tags
Jan
15
 revised Spaces with equal homotopy groups but different homology groups?
added 131 characters in body
Jan
15
 comment Spaces with equal homotopy groups but different homology groups?
Related: math.stackexchange.com/q/88943/152
Jan
15
 answered Spaces with equal homotopy groups but different homology groups?
Jan
14
 answered Neutral elements in the unoriented cobordism.
Jan
11
 revised The proof of $\hat{b}(\hat{a}\cdot\hat{c})-\hat{c}(\hat{a}\cdot\hat{b})=\hat{a}\times(\hat{b}\times\hat{c})$
title
Jan
4
 comment Matrix Representation of Octonions
Matrix multiplication is associative, so what do you hope for?
Jan
4
 comment Why does the Dedekind Cut work well enough to define the Reals?
related: gutenberg.org/files/21016/21016-pdf.pdf (translation of Dedekind's paper)
Jan
3
 comment Simple group of order 168
related: math.stackexchange.com/a/1402
Jan
2
 revised Generalization of “easy” 1-D proof of Brouwer fixed point theorem
link
Jan
2
 revised Product of $SU(2)$ representations
edited title
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