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Dima Pasechnik's user avatar
Dima Pasechnik's user avatar
Dima Pasechnik's user avatar
Dima Pasechnik
  • Member for 15 years, 2 months
  • Last seen this week
14 votes
2 answers
1k views

inverse limits of group algebras and profinite groups

13 votes
1 answer
847 views

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

13 votes
1 answer
672 views

A folklore theorem on SOS matrices?

11 votes
5 answers
2k views

area of triangle from coefficients of its cubic?

9 votes
1 answer
663 views

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

8 votes
1 answer
460 views

projective plane cubics with exactly 9 real points

8 votes
1 answer
610 views

Plane sextics admitting a conic with 6 double-contact points

8 votes
2 answers
771 views

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

7 votes
1 answer
841 views

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

7 votes
1 answer
381 views

2x2-determinantal representations of cubic curves

7 votes
1 answer
314 views

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

7 votes
2 answers
423 views

non-rigidity of interior points in polyhedral triangulations?

7 votes
1 answer
400 views

old notation for equations of 4-variate quartics

6 votes
1 answer
588 views

classical harmonic polynomials - an algebraic view

6 votes
1 answer
284 views

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

6 votes
1 answer
1k views

do you know this determinant (basic commutative algebra)?

5 votes
1 answer
394 views

projective representations of a finite group over reals

5 votes
1 answer
488 views

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

5 votes
1 answer
326 views

polynomial maps from reducible plane curves to conics

5 votes
1 answer
362 views

speeding up Gosper and WZ algorithms

5 votes
2 answers
309 views

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

5 votes
2 answers
425 views

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

5 votes
1 answer
261 views

Metric on an embedded product of two hyperbolic planes

5 votes
1 answer
359 views

Pythagorean numbers of real cyclotomic fields

4 votes
1 answer
378 views

Epstein zeta function of Barnes-Wall and related lattices

4 votes
1 answer
555 views

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

4 votes
1 answer
194 views

Induction theorem for real symplectic characters of finite groups?

4 votes
1 answer
197 views

complexity of bounded knapsack with spoilage

4 votes
3 answers
407 views

lines through A_n reflection arrangement and permutations

4 votes
2 answers
426 views

a group from a family of bijections X->Y