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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.
Jun
8
awarded  Nice Question
May
28
accepted dimensions of strata of Pfaffian varieties
May
28
asked dimensions of strata of Pfaffian varieties
May
12
awarded  Popular Question
May
8
asked Why “Fourier”-Mukai?
Apr
28
awarded  Revival
Apr
27
answered Do mapping classes have gonality?
Apr
19
asked Parabolic bundles on elliptic curves
Apr
13
comment 13 months and not even one report. what would you do?
Hey actually it is over! It was accepted more or less one month ago. Thank you for your thought.
Mar
27
accepted Inserting maple or macaulay script in a paper
Mar
27
comment Inserting maple or macaulay script in a paper
ok, some time go mathematical writng was ok even here, but nevermind