User Lev Borisov

35 votes

Advice for pure-math Phd students

answered Dec 28, 2013 at 20:47

33 votes

Accepted

The sum of squared logarithms conjecture

answered May 29, 2015 at 14:55

24 votes

Interesting examples of vacuous / void entities

answered Feb 10, 2014 at 2:28

15 votes

Accepted

Die hard nilpotent spaces

answered Aug 2, 2014 at 17:01

10 votes

Accepted

Eigenvalues of a matrix with entries involving combinatorics

answered Nov 28, 2016 at 14:49

9 votes

Basic question about polytope duals

answered Feb 13, 2016 at 23:46

8 votes

Accepted

A sum over partitions involving "subpartitions"

answered Jul 17, 2021 at 20:10

7 votes

Accepted

Proof for a rank-one decomposition theorem of positive (semi) definite matrices

answered Sep 2, 2014 at 18:36

7 votes

Resolving nodes of a quintic CY 3-fold

answered Oct 25, 2014 at 2:15

7 votes

The sequence $a_{n+1}=\left\lceil \frac{-1+\sqrt{5}}{2}a_{n}-a_{n-1} \right\rceil$ is periodic

answered Feb 3, 2016 at 1:59

7 votes

Can one prove that toric varieties are Cohen-Macaulay by finding a regular sequence?

answered Apr 6, 2014 at 19:42

6 votes

Line-preserving bijection of ${\mathbb{R}}^n$ onto itself

answered Aug 21, 2013 at 1:44

6 votes

Accepted

Estimates on the number of vertices of reflexive polytopes

answered Sep 7, 2013 at 21:06

6 votes

Accepted

binomial/factorial identity mod p

answered Jul 2, 2015 at 1:35

5 votes

Analytic continuation of the double sum $\sum_{n,m\ge0}x^ny^mt^{nm}$

answered Feb 11, 2016 at 1:26

5 votes

Accepted

Is there a critical point of a polynomial $f$ within every disc having as diameter the line segment between two zeros of $f$?

answered Feb 21, 2016 at 17:14

5 votes

Crepant resolutions of toric varieties

answered Dec 9, 2013 at 22:09

5 votes

Accepted

Finite Quotients and Resolutions of Singularities

answered Jun 9, 2014 at 23:40

5 votes

Assessing effectiveness of (epsilon, delta) definitions

answered Feb 27, 2014 at 16:34

5 votes

On the Grassmannian Gr(2,5) and spheres

answered Jan 11, 2014 at 1:40

4 votes

Accepted

Number of solutions of linear homogenous Diophantine equation inside a box

answered Feb 9, 2014 at 21:58

4 votes

Dimension of a homogeneous polynomial system

answered Sep 7, 2013 at 16:08

4 votes

Minimal area of non-planar lattice curves

answered May 4, 2014 at 21:21

4 votes

which varieties can appear as exceptional divisors?

answered Dec 28, 2013 at 13:26

4 votes

Is there a Riemann-Roch like result for meromorphic differentials with all periods vanishing?

answered Sep 14, 2013 at 11:52

4 votes

Global section of tensor product

answered Sep 20, 2013 at 12:08

4 votes

Accepted

Is there a canonical map from the cohomology of orbifold chiral de Rham on an orbifold to the cohomology of chiral de Rham on a crepant resolution?

answered Aug 21, 2013 at 2:02

4 votes

Accepted

Macaulay's example of prime ideals in $\mathbb C[X_1,X_2,X_3]$ having large number of generators

answered May 18, 2015 at 15:49

3 votes

Where to find (personal) motivation

answered Aug 20, 2014 at 23:28

3 votes

Show that the Minkowski sum of two triangles in 3D is the union of Minkowski sums of each triangle along the other's edges?

answered Dec 31, 2015 at 14:41

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63 Answers

Advice for pure-math Phd students

The sum of squared logarithms conjecture

Interesting examples of vacuous / void entities

Die hard nilpotent spaces

Eigenvalues of a matrix with entries involving combinatorics

Basic question about polytope duals

A sum over partitions involving "subpartitions"

Proof for a rank-one decomposition theorem of positive (semi) definite matrices

Resolving nodes of a quintic CY 3-fold

The sequence $a_{n+1}=\left\lceil \frac{-1+\sqrt{5}}{2}a_{n}-a_{n-1} \right\rceil$ is periodic

Can one prove that toric varieties are Cohen-Macaulay by finding a regular sequence?

Line-preserving bijection of ${\mathbb{R}}^n$ onto itself

Estimates on the number of vertices of reflexive polytopes

binomial/factorial identity mod p

Analytic continuation of the double sum $\sum_{n,m\ge0}x^ny^mt^{nm}$

Is there a critical point of a polynomial $f$ within every disc having as diameter the line segment between two zeros of $f$?

Crepant resolutions of toric varieties

Finite Quotients and Resolutions of Singularities

Assessing effectiveness of (epsilon, delta) definitions

On the Grassmannian Gr(2,5) and spheres

Number of solutions of linear homogenous Diophantine equation inside a box

Dimension of a homogeneous polynomial system

Minimal area of non-planar lattice curves

which varieties can appear as exceptional divisors?

Is there a Riemann-Roch like result for meromorphic differentials with all periods vanishing?

Global section of tensor product

Is there a canonical map from the cohomology of orbifold chiral de Rham on an orbifold to the cohomology of chiral de Rham on a crepant resolution?

Macaulay's example of prime ideals in $\mathbb C[X_1,X_2,X_3]$ having large number of generators

Where to find (personal) motivation

Show that the Minkowski sum of two triangles in 3D is the union of Minkowski sums of each triangle along the other's edges?