User ViHdzP - Mathematics Stack Exchange

20 votes

2 answers

295 views

Why is $!n\pmod{n+k}$ a multiple of $k+1$ so often?

asked Dec 27, 2019 at 3:39

13 votes

2 answers

636 views

What are the main ideas needed to prove that only $92$ Johnson solids exist?

asked Jan 6, 2020 at 4:07

6 votes

3 answers

878 views

Are there such things as infinite-dimensional regular polytopes?

asked Nov 27, 2019 at 6:01

4 votes

1 answer

433 views

When can a regular simplex be inscribed in a regular hypercube?

asked Apr 27, 2020 at 5:07

4 votes

3 answers

1k views

Real Schur decomposition of orthogonal matrix

asked Dec 1, 2021 at 1:54

4 votes

2 answers

305 views

Characterization of interior points of a convex polytope

asked Dec 27, 2021 at 10:10

4 votes

2 answers

281 views

What is the complete classification of the uniform tesselations?

asked Apr 6, 2020 at 2:07

4 votes

1 answer

181 views

Inductive hypothesis in surreal multiplication proof

asked Apr 23, 2022 at 21:30

3 votes

2 answers

201 views

Descartes-like formula in 4D

asked Apr 25, 2020 at 5:17

3 votes

0 answers

84 views

For which regular $n$-gons are there two sides/diagonals with a rational ratio other than $1$?

asked Apr 5, 2020 at 20:25

3 votes

1 answer

160 views

Can a Riemann integral be defined over arbitrary compact subsets of $\mathbb R$?

asked May 25, 2023 at 9:44

3 votes

1 answer

58 views

Two primitive roots add to a third

asked Mar 20 at 6:37

3 votes

1 answer

72 views

Transitivity of rational orthogonal matrices

asked May 8 at 11:32

3 votes

1 answer

152 views

Algebraic degree of $\cos\left(\frac{p\pi}{q}\right)$

asked Nov 19, 2019 at 2:57

2 votes

2 answers

61 views

Equal angles are congruent, in an arbitrary symmetric bilinear space

asked May 8 at 1:09

2 votes

3 answers

178 views

A proof for bivector decomposition

asked Sep 16, 2023 at 23:41

2 votes

1 answer

119 views

Dimension of function space $X \to \mathbb F$

asked Sep 22, 2023 at 0:42

2 votes

1 answer

217 views

What is the complete list of radially equilateral polyhedra?

asked Jan 3, 2020 at 18:48

2 votes

1 answer

63 views

Algorithm to find the $n$ with $d(n)\leq\sqrt[k]{n}$

asked Dec 10, 2019 at 19:00

2 votes

1 answer

157 views

Continuous functions $\mathbb R_\ell\to\mathbb R_\ell$

asked Sep 5, 2022 at 0:08

2 votes

2 answers

305 views

Proof of Straszewicz's theorem

asked Feb 27, 2022 at 1:15

1 vote

1 answer

76 views

Possible polygons in uniform polyhedra

asked Oct 31, 2019 at 6:19

1 vote

1 answer

650 views

What are the fixed points of $f^n$ for $f(z)=\frac{z^2-1}{2z}$?

asked Nov 8, 2019 at 3:31

1 vote

1 answer

164 views

Congruences of consecutive Fibonacci numbers

asked Nov 16, 2019 at 6:05

1 vote

1 answer

65 views

Flags of convex polytope are oppositely oriented

asked Oct 12, 2023 at 20:45

1 vote

0 answers

29 views

Density of convex set at a point

asked Nov 18, 2023 at 15:23

1 vote

0 answers

23 views

Markov chains exist

asked Mar 20 at 5:11

1 vote

1 answer

109 views

Linear independence of tensor products $\{v_i \otimes w_j\}$ without choice

asked May 18 at 19:59

0 votes

1 answer

120 views

Cofinality of functions $\mathbb N\to\mathbb N$ under eventual domination

asked Mar 19, 2022 at 1:33

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29 Questions

Why is $!n\pmod{n+k}$ a multiple of $k+1$ so often?

What are the main ideas needed to prove that only $92$ Johnson solids exist?

Are there such things as infinite-dimensional regular polytopes?

When can a regular simplex be inscribed in a regular hypercube?

Real Schur decomposition of orthogonal matrix

Characterization of interior points of a convex polytope

What is the complete classification of the uniform tesselations?

Inductive hypothesis in surreal multiplication proof

Descartes-like formula in 4D

For which regular $n$-gons are there two sides/diagonals with a rational ratio other than $1$?

Can a Riemann integral be defined over arbitrary compact subsets of $\mathbb R$?

Two primitive roots add to a third

Transitivity of rational orthogonal matrices

Algebraic degree of $\cos\left(\frac{p\pi}{q}\right)$

Equal angles are congruent, in an arbitrary symmetric bilinear space

A proof for bivector decomposition

Dimension of function space $X \to \mathbb F$

What is the complete list of radially equilateral polyhedra?

Algorithm to find the $n$ with $d(n)\leq\sqrt[k]{n}$

Continuous functions $\mathbb R_\ell\to\mathbb R_\ell$

Proof of Straszewicz's theorem

Possible polygons in uniform polyhedra

What are the fixed points of $f^n$ for $f(z)=\frac{z^2-1}{2z}$?

Congruences of consecutive Fibonacci numbers

Flags of convex polytope are oppositely oriented

Density of convex set at a point

Markov chains exist

Linear independence of tensor products $\{v_i \otimes w_j\}$ without choice

Cofinality of functions $\mathbb N\to\mathbb N$ under eventual domination