3,202 reputation
920
bio website
location
age
visits member for 4 years, 4 months
seen yesterday

Dec
11
awarded  Good Answer
Dec
11
comment Andre-Quillen Homology of the cuspidal curve $k[x,y]/(x^2 - y^3)$
whoops, guess I should be more up on my math-social-media feeds...
Dec
11
comment Andre-Quillen Homology of the cuspidal curve $k[x,y]/(x^2 - y^3)$
The transitivity sequence should give a long exact sequence in homology, and you seem to be claiming that it collapses- why is the boundary zero? (probably I've confused my shifts somehow and the map is obviously zero?)
Nov
25
awarded  Nice Answer
Oct
17
awarded  Nice Answer
Jul
29
awarded  Yearling
Jun
3
awarded  Nice Question
Mar
28
awarded  Guru
Mar
22
comment Refining homotopy commutative maps of spectra to maps of E_{\infty}-ring spectra
math.uiuc.edu/~mando/papers/koandtmf.pdf
Feb
11
comment What are necessary and sufficient conditions for the product of spheres to be paralellizable?
This is false for $S^{2n} \times S^{2n}$ with $n>0$, because the Euler class of the tangent bundle is nonzero.
Dec
31
awarded  Enlightened
Dec
31
awarded  Nice Answer
Dec
9
comment Orientable Surface Covers Non-Orientable Surface
I don't know what you're allowed to use but a nice fact about the Euler characteristic is that if $E \rightarrow B$ is an $n$-sheeted covering, then the Euler characteristic of $E$ is $n$ times the Euler characteristic of $B$. If $E$ is orientable, the Euler characteristic also equals $2-2g$, if it's non-orientable the Euler characteristic is $2-g$ where $g$ is the genus. So... consider the double cover. :)
Nov
21
awarded  algebraic-topology
Aug
17
comment Inclusion $O(2n)/U(n)\to GL(2n,\mathbb{R})/GL(n,\mathbb{C}) $
math.washington.edu/~mitchell/Notes/prin.pdf
Aug
17
comment Why is there no compact manifold without boundary with the following homology groups?
haha thanks Georges :)
Aug
16
comment How to give the coproduct of differential graded algebras explicitly?
What's the differential on $H_*(\Omega X)$?
Aug
16
answered Inclusion $O(2n)/U(n)\to GL(2n,\mathbb{R})/GL(n,\mathbb{C}) $
Aug
16
answered Why is there no compact manifold without boundary with the following homology groups?
Aug
9
comment Homotopy operator for the Gysin sequnce
What does "homotopy operator" mean?