4,839 reputation
11957
bio website math.berkeley.edu/~cgerig
location UC Berkeley
age 25
visits member for 3 years, 7 months
seen 25 mins ago

Undergrad: Allen Hatcher's recommendation got me into Cornell (I learned Algebraic Topology through his book in high school, along with some email correspondences). But I majored in Engineering Physics and did experimental research on gravity.

Grad: I started my PhD in experimental atomic physics at Berkeley, but quit to do math. I am now a student of Michael Hutchings!


10h
awarded  Nice Question
1d
asked Does $S^4$ have a “symplecto-homeomorphic” structure?
Aug
28
comment Classes in $H^3(G; \mathbb{Z})$ that restrict to zero on abelian subgroups
I wrote up computations for all p-groups which contain an index-p cyclic subgroup; it's on my website. Perhaps you can use them (pass from $\mathbb{Z}_p$-coefficients to $\mathbb{Z}$ via Bockstein) to find your desired integral elements (they'll have to come from degree 2 elements in mod-p cohomology for the generalized quaternions or split-metacyclic groups). Anyway, now that you're here at Berkeley with me, we can meet sometime and chat further! (and recruit Qiaochu to use his secret category theory powers)
Aug
28
comment Classes in $H^3(G; \mathbb{Z})$ that restrict to zero on abelian subgroups
What motivates this question?
Aug
25
comment Classes in $H^3(G; \mathbb{Z})$ that restrict to zero on abelian subgroups
@MatthiasWendt, unfortunately that's only for mod-p cohomology. But perhaps the Bockstein homomorphism is nontrivial in this case, which will produce essential elements with $\mathbb{Z}$-coefficients.
Aug
25
comment Classes in $H^3(G; \mathbb{Z})$ that restrict to zero on abelian subgroups
Note that I'm cheating with the example I gave, because $H^\text{odd}$ is zero for cyclic groups.
Aug
25
revised Classes in $H^3(G; \mathbb{Z})$ that restrict to zero on abelian subgroups
deleted 1359 characters in body
Aug
25
answered Classes in $H^3(G; \mathbb{Z})$ that restrict to zero on abelian subgroups
Aug
10
comment Reference Request: “Neck Stretching Procedure” (In Symplectic Field Theory)
It's on page 13, around Definition 1.6.1.
Jul
20
accepted 'Contactization' and Symplectization
Jul
14
reviewed Approve suggested edit on The error in Petrovski and Landis' proof of the 16th Hilbert problem
Jul
7
reviewed Approve suggested edit on Question about Woodin's stationary tower
Jul
2
awarded  Inquisitive
Jul
2
awarded  Curious
Jun
27
reviewed Approve suggested edit on Paley-Wiener type theorem for integral functions with compact support
Jun
26
reviewed Reject suggested edit on nontrivial theorems with trivial proofs
Jun
20
reviewed Approve suggested edit on Proof without using Yoneda's lemma?
Jun
17
comment Is the Nijenhuis tensor an obstruction to the existence of non constant pseudo-holomorphic maps?
Ah I am implicitly fixing the target $(M,J_M)$. I speak of generic $(N,J_N)$ which is consistent with your observation.
Jun
17
answered Is the Nijenhuis tensor an obstruction to the existence of non constant pseudo-holomorphic maps?
Jun
4
revised spectral sequence with non-trivial action on coefficients
edited tags