User Dima Pasechnik - MathOverflow

14 votes

2 answers

1k views

inverse limits of group algebras and profinite groups

asked Dec 5, 2011 at 6:03

13 votes

1 answer

847 views

a normal form for matrices over Z[x]/(x^2-1) ?

asked Oct 30, 2012 at 9:52

13 votes

1 answer

672 views

A folklore theorem on SOS matrices?

asked Jan 16 at 18:39

11 votes

5 answers

2k views

area of triangle from coefficients of its cubic?

asked Nov 23, 2011 at 7:34

9 votes

1 answer

663 views

Fundamental domains for subgroups of $\operatorname{SL}(n, \mathbb{Z})$

asked Jan 11, 2025 at 21:15

8 votes

1 answer

460 views

projective plane cubics with exactly 9 real points

asked Jun 13, 2018 at 16:18

8 votes

1 answer

610 views

Plane sextics admitting a conic with 6 double-contact points

asked May 12, 2025 at 2:16

8 votes

2 answers

771 views

asymptotic for the number of involutions in GL(n,2)

asked Sep 29, 2015 at 23:16

7 votes

1 answer

841 views

A direct proof of a property of symmetric 2x2-determinants

asked Jun 21, 2017 at 9:12

7 votes

1 answer

381 views

2x2-determinantal representations of cubic curves

asked Jun 21, 2017 at 14:39

7 votes

1 answer

314 views

Do convex closed semialgebraic hyperplane cross-sections imply semi-algebraicity?

asked Nov 30, 2017 at 19:20

7 votes

2 answers

423 views

non-rigidity of interior points in polyhedral triangulations?

asked Jul 24, 2011 at 11:41

7 votes

1 answer

400 views

old notation for equations of 4-variate quartics

asked Jan 9 at 6:19

6 votes

1 answer

588 views

classical harmonic polynomials - an algebraic view

asked Mar 5, 2025 at 20:20

6 votes

1 answer

284 views

Solving $2^{x+1} m -1=p^y$ for prime $p$ and natural $x,y$

asked May 16, 2024 at 17:17

6 votes

1 answer

1k views

do you know this determinant (basic commutative algebra)?

asked Apr 11, 2012 at 17:15

5 votes

1 answer

394 views

projective representations of a finite group over reals

asked Sep 8, 2012 at 5:32

5 votes

1 answer

488 views

centralizer of the order 2^k cyclic permutation matrix over F_2

asked Jul 28, 2013 at 19:52

5 votes

1 answer

326 views

polynomial maps from reducible plane curves to conics

asked Sep 8, 2017 at 9:18

5 votes

1 answer

362 views

speeding up Gosper and WZ algorithms

asked Jan 27, 2017 at 8:55

5 votes

2 answers

309 views

name for a polytope constructed from a system of linear equations?

asked Aug 31, 2013 at 2:47

5 votes

2 answers

425 views

Computing the Abelian invariants of a subgroup of a f.g. Abelian group

asked Apr 5, 2024 at 9:18

5 votes

1 answer

261 views

Metric on an embedded product of two hyperbolic planes

asked Dec 19, 2024 at 6:03

5 votes

1 answer

359 views

Pythagorean numbers of real cyclotomic fields

asked Sep 19, 2022 at 8:37

4 votes

1 answer

378 views

Epstein zeta function of Barnes-Wall and related lattices

asked Jan 24, 2023 at 13:56

4 votes

1 answer

555 views

is every positive real cyclotomic number the norm of a cyclotomic?

asked Apr 26, 2021 at 17:12

4 votes

1 answer

194 views

Induction theorem for real symplectic characters of finite groups?

asked Jan 20, 2025 at 3:48

4 votes

1 answer

197 views

complexity of bounded knapsack with spoilage

asked Jan 9, 2019 at 11:35

4 votes

3 answers

407 views

lines through A_n reflection arrangement and permutations

asked Nov 24, 2012 at 6:59

4 votes

2 answers

426 views

a group from a family of bijections X->Y

asked Jan 8, 2012 at 10:34

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60 Questions

inverse limits of group algebras and profinite groups

a normal form for matrices over Z[x]/(x^2-1) ?

A folklore theorem on SOS matrices?

area of triangle from coefficients of its cubic?

Fundamental domains for subgroups of $\operatorname{SL}(n, \mathbb{Z})$

projective plane cubics with exactly 9 real points

Plane sextics admitting a conic with 6 double-contact points

asymptotic for the number of involutions in GL(n,2)

A direct proof of a property of symmetric 2x2-determinants

2x2-determinantal representations of cubic curves

Do convex closed semialgebraic hyperplane cross-sections imply semi-algebraicity?

non-rigidity of interior points in polyhedral triangulations?

old notation for equations of 4-variate quartics

classical harmonic polynomials - an algebraic view

Solving $2^{x+1} m -1=p^y$ for prime $p$ and natural $x,y$

do you know this determinant (basic commutative algebra)?

projective representations of a finite group over reals

centralizer of the order 2^k cyclic permutation matrix over F_2

polynomial maps from reducible plane curves to conics

speeding up Gosper and WZ algorithms

name for a polytope constructed from a system of linear equations?

Computing the Abelian invariants of a subgroup of a f.g. Abelian group

Metric on an embedded product of two hyperbolic planes

Pythagorean numbers of real cyclotomic fields

Epstein zeta function of Barnes-Wall and related lattices

is every positive real cyclotomic number the norm of a cyclotomic?

Induction theorem for real symplectic characters of finite groups?

complexity of bounded knapsack with spoilage

lines through A_n reflection arrangement and permutations

a group from a family of bijections X->Y