User Moritz Firsching

10 votes

Generalization of the equilateral triangle?

answered Aug 29, 2014 at 10:46

10 votes

Double kissing problem

answered Jun 12, 2015 at 18:16

9 votes

For which $n$ is there a permutation such that the sum of any two adjacent elements is a prime?

answered Jun 6, 2016 at 16:01

9 votes

Put P inside Q! polygons/polyhedra

answered Aug 2, 2014 at 15:59

9 votes

Does $\{\tau(1)\tau(2)+\cdots+\tau(n-1)\tau(n)+\tau(n)\tau(1):\ \tau\in S_n\}$ contain a unique multiple of $n^2$ for each $n\ge6$?

answered Jul 15, 2021 at 9:57

7 votes

Maximizing the area of a region involving triangles

answered Oct 23, 2021 at 11:53

7 votes

When does there exist a convex polyhedron with given edge lengths?

answered Apr 17, 2016 at 0:20

6 votes

Convex polyhedra, combinatorial types and Symmetry

answered Feb 22, 2016 at 14:40

6 votes

What's the best way to test if a sphere is a polytope? (algorithms for the Simplicial Steinitz Problem)

answered Feb 25, 2016 at 14:05

6 votes

Communal problem books

answered Mar 4, 2015 at 11:00

6 votes

Who first defined _simply connected_, reference?

answered Mar 24, 2014 at 9:48

6 votes

Map from simplex to itself that preserves sub-simplices

answered Sep 3, 2013 at 9:12

6 votes

Accepted

combinatorics on cyclic sequences

answered Mar 26, 2016 at 9:50

6 votes

Triangles whose vertices and center have all the same color

answered Jul 20, 2017 at 20:09

6 votes

Accepted

Chromatic number of transposition graph of permutations

answered Aug 28, 2017 at 8:37

5 votes

Accepted

Algorithm for Reconstructing Point Sites from a Voronoi Diagram

answered Dec 13, 2016 at 9:50

4 votes

Map from simplex to itself that preserves sub-simplices

answered Dec 30, 2016 at 19:27

3 votes

Integer sets with forbidden differences

answered Feb 26, 2016 at 9:24

3 votes

Accepted

Choosing the weights of a Voronoi diagram -- is this function always the gradient of another function?

answered Feb 23, 2016 at 10:27

3 votes

Problem equivalent to "largest square in a cube"

answered Oct 19, 2014 at 19:35

3 votes

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

answered Sep 4, 2013 at 8:19

3 votes

Accepted

Hamiltonian paths in bipartite graphs with 2 sets of "almost" same cardinality

answered Aug 30, 2017 at 8:46

3 votes

Complexity of computing kissing numbers of triangles with given side lengths

answered Jul 21, 2017 at 7:45

3 votes

Iteration cycles of Z_n weights in path graphs: Why cycles of length 182 for a 6-node path?

answered Aug 26, 2017 at 19:40

3 votes

Accepted

Geometric realization of combinatorial self-duality in polytopes

answered Jul 6, 2019 at 20:44

3 votes

Accepted

Sufficient criterion for a simplicial sphere to be polytopal

answered Jul 6, 2019 at 21:01

3 votes

Accepted

Hausdorff dimension of Apollonian circle packing, 1.305686729, 1.305688 or yet something else?

answered Jul 25, 2020 at 19:18

3 votes

Definition of "regular" in Stringham's "Regular figures in n-dimensional space"

answered May 19, 2021 at 19:05

3 votes

How many possible values for the determinant of an $n\times n$-matrix with entries $1,2,\dots,n^2$?

answered Jun 7, 2021 at 15:22

3 votes

Maximizing the area of a region involving triangles

answered Oct 22, 2021 at 13:18

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70 Answers

Generalization of the equilateral triangle?

Double kissing problem

For which $n$ is there a permutation such that the sum of any two adjacent elements is a prime?

Put P inside Q! polygons/polyhedra

Does $\{\tau(1)\tau(2)+\cdots+\tau(n-1)\tau(n)+\tau(n)\tau(1):\ \tau\in S_n\}$ contain a unique multiple of $n^2$ for each $n\ge6$?

Maximizing the area of a region involving triangles

When does there exist a convex polyhedron with given edge lengths?

Convex polyhedra, combinatorial types and Symmetry

What's the best way to test if a sphere is a polytope? (algorithms for the Simplicial Steinitz Problem)

Communal problem books

Who first defined _simply connected_, reference?

Map from simplex to itself that preserves sub-simplices

combinatorics on cyclic sequences

Triangles whose vertices and center have all the same color

Chromatic number of transposition graph of permutations

Algorithm for Reconstructing Point Sites from a Voronoi Diagram

Map from simplex to itself that preserves sub-simplices

Integer sets with forbidden differences

Choosing the weights of a Voronoi diagram -- is this function always the gradient of another function?

Problem equivalent to "largest square in a cube"

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

Hamiltonian paths in bipartite graphs with 2 sets of "almost" same cardinality

Complexity of computing kissing numbers of triangles with given side lengths

Iteration cycles of Z_n weights in path graphs: Why cycles of length 182 for a 6-node path?

Geometric realization of combinatorial self-duality in polytopes

Sufficient criterion for a simplicial sphere to be polytopal

Hausdorff dimension of Apollonian circle packing, 1.305686729, 1.305688 or yet something else?

Definition of "regular" in Stringham's "Regular figures in n-dimensional space"

How many possible values for the determinant of an $n\times n$-matrix with entries $1,2,\dots,n^2$?

Maximizing the area of a region involving triangles