User Nikita Kalinin

115 votes

3 answers

5k views

The number $\pi$ and summation by $SL(2,\mathbb Z)$

asked Sep 16, 2016 at 15:54

54 votes

2 answers

3k views

Is it known? A sum over lattice parallelograms of area one is equal to $\pi$

asked Sep 17 at 21:47

36 votes

2 answers

2k views

Different styles of writing/reading articles

asked Feb 18, 2015 at 17:46

36 votes

4 answers

6k views

Why are differential forms called closed and exact?

asked Dec 6, 2010 at 21:32

35 votes

3 answers

6k views

How many quit mathematics because they (are afraid that they) can not find a permanent job?

asked Apr 1, 2017 at 20:33

30 votes

8 answers

3k views

A variation of the law of large numbers for random points in a square

asked Jun 9, 2020 at 8:21

25 votes

6 answers

7k views

prime ideals in C([0,1])

asked Aug 16, 2010 at 20:37

15 votes

2 answers

927 views

$\pi_4$ of simply-connected 4-manifold

asked Aug 31, 2010 at 6:31

14 votes

2 answers

3k views

Slice knots and exotic $\mathbb R^4$

asked Oct 18, 2010 at 13:00

14 votes

3 answers

3k views

Quadratic reciprocity and Weil reciprocity theorem

asked Jun 7, 2012 at 11:14

13 votes

6 answers

2k views

Polynomial contact structures on $RP^3$

asked Mar 9, 2011 at 21:43

13 votes

2 answers

483 views

How the hyperbolic metric changes when we add a puncture?

asked Sep 7, 2019 at 19:07

13 votes

0 answers

496 views

Strange formula in arithmetic dynamic

asked Apr 10, 2017 at 3:16

12 votes

2 answers

740 views

Can any numerical polynomial be a Hilbert polynomial of something?

asked Mar 26, 2012 at 13:32

11 votes

0 answers

233 views

Mathematical pendulum and $\mathbb C P^n$

asked Oct 19, 2020 at 12:11

10 votes

2 answers

897 views

Sum of two tangent bundles of $S^{2n}$

asked Mar 26, 2013 at 21:31

8 votes

6 answers

2k views

Uncountable preimage of every point

asked Nov 27, 2010 at 20:24

8 votes

0 answers

263 views

Positive integer solutions of $ab+ac+ad+bc+bd+cd=n$

asked Aug 21, 2021 at 15:17

8 votes

1 answer

354 views

Constants of motion for Droop equation

asked Mar 3, 2019 at 15:57

7 votes

1 answer

456 views

Space-discriminating injective curve

asked Nov 12, 2010 at 23:57

7 votes

4 answers

973 views

I was wondering if the set of singular loops is a (somewhere) submanifold of loop space?

asked Sep 10, 2011 at 7:35

6 votes

1 answer

437 views

G = [G,G] with two generators

asked Sep 27, 2011 at 7:42

6 votes

0 answers

674 views

Bezout Theorem in $\mathbb P^3$

asked Sep 1, 2013 at 16:23

6 votes

1 answer

693 views

Nagata's conjecture in positive characteristic

asked Oct 6, 2013 at 14:38

6 votes

1 answer

185 views

Maximizing ratio volume/diameter^n by an affinity

asked Dec 7, 2013 at 10:14

6 votes

3 answers

855 views

Fundamental solution of Discrete Laplace in the plane

asked Oct 10, 2015 at 17:31

5 votes

1 answer

222 views

Switching oriented paths in a graph

asked Feb 5, 2019 at 7:25

5 votes

2 answers

368 views

Diameter-area ratio for affine tranformations.

asked May 13, 2013 at 18:02

5 votes

2 answers

635 views

Area of a lattice polygon in terms of its width

asked Mar 27, 2013 at 9:35

5 votes

3 answers

2k views

Minimal genus, adjunction inequality

asked Dec 12, 2011 at 20:25

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55 Questions

The number $\pi$ and summation by $SL(2,\mathbb Z)$

Is it known? A sum over lattice parallelograms of area one is equal to $\pi$

Different styles of writing/reading articles

Why are differential forms called closed and exact?

How many quit mathematics because they (are afraid that they) can not find a permanent job?

A variation of the law of large numbers for random points in a square

prime ideals in C([0,1])

$\pi_4$ of simply-connected 4-manifold

Slice knots and exotic $\mathbb R^4$

Quadratic reciprocity and Weil reciprocity theorem

Polynomial contact structures on $RP^3$

How the hyperbolic metric changes when we add a puncture?

Strange formula in arithmetic dynamic

Can any numerical polynomial be a Hilbert polynomial of something?

Mathematical pendulum and $\mathbb C P^n$

Sum of two tangent bundles of $S^{2n}$

Uncountable preimage of every point

Positive integer solutions of $ab+ac+ad+bc+bd+cd=n$

Constants of motion for Droop equation

Space-discriminating injective curve

I was wondering if the set of singular loops is a (somewhere) submanifold of loop space?

G = [G,G] with two generators

Bezout Theorem in $\mathbb P^3$

Nagata's conjecture in positive characteristic

Maximizing ratio volume/diameter^n by an affinity

Fundamental solution of Discrete Laplace in the plane

Switching oriented paths in a graph

Diameter-area ratio for affine tranformations.

Area of a lattice polygon in terms of its width

Minimal genus, adjunction inequality