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visits member for 4 years, 9 months
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Sep
30
awarded  Tumbleweed
Sep
23
asked singular locus of $\mathcal{A}_3(2)^{hyp}$
Sep
21
accepted deformations of vector bundles on curves
Sep
17
asked deformations of vector bundles on curves
Sep
4
asked Action of $(\mathbb{Z}/2g\mathbb{Z})$ on quadratic forms on $\mathbb{Z}/2\mathbb{Z}$-vector space
Sep
1
comment Top specialized journals
do you really think that J Topology is at the level of JDG or G&T? my (limited) perception is that it is a little lower
Aug
25
comment symmetric theta structures and arithmetic subgroups
good point! it is not completely clear to me yet... :D just kidding: as I have edited, the reasons for which there are different actions of the modular groups on characteristics (one or two orbits) -depending on the level - is still unclear to me.
Aug
25
revised symmetric theta structures and arithmetic subgroups
added 245 characters in body
Aug
25
revised symmetric theta structures and arithmetic subgroups
edited tags
Aug
25
revised symmetric theta structures and arithmetic subgroups
added 2 characters in body
Aug
25
asked symmetric theta structures and arithmetic subgroups
Aug
13
accepted orthogonal group in characteristic 2
Aug
13
comment orthogonal group in characteristic 2
Yes I meant the finite field of order 2, thank you! What is the precise book reference that you suggest?
Aug
13
comment orthogonal group in characteristic 2
no, I am sorry, I should have explained. By even and odd I mean the Arf invariant of a quadratic form on a $\mathbb{Z}_2$-vector space. I will correct the question.
Aug
13
asked orthogonal group in characteristic 2
Jul
2
awarded  Inquisitive
Jul
2
awarded  Curious
Jun
30
comment Index of congruence modular subgroup of level (1,d)
Very nice proof. As far as I understand the same proof would not hold for even $d$, right?
Jun
17
awarded  Investor
Jun
9
comment Generating the symplectic group
There's a cute subgroup of $Sp(4, \mathbb{Z}_2)$ of index 6, which is the stablizer of an odd theta-characteristic (seen as a quadratic form on the 2-torsion point). I wonder if it is this one.