Question

Is there a closed form formula for counting 2-regular labelled graphs?

score 215 · Answer 1 · 2021-04-27 14:45:46

215

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Is there a closed form formula for counting 2-regular labelled graphs?

Published on 27 Apr 2021 - 14:45

score 158 · Answer 2 · 2021-05-06 02:30:27

158

Views

Geometric quantity related to $a^3 + b^3 + c^3$

Published on 06 May 2021 - 2:30

score 94 · Answer 3 · 2021-05-06 23:34:26

94

Views

What's the supremum of of the ratio of perimeter to diameter of a convex $n$-gon(for a given n)?

Published on 06 May 2021 - 23:34

score 97 · Answer 4 · 2021-05-09 00:04:40

97

Views

Is the honeycomb lattice the double graph of another graph?

Published on 09 May 2021 - 0:04

score 556 · Answer 5 · 2026-03-26 04:36:46

556

Views

Suppose we have $n$ points in a plane, not all on the same line. Then they are determining at least $n$ different lines.

Published on 26 Mar 2026 - 4:36

score 148 · Answer 6 · 2021-06-07 12:22:30

148

Views

Algorithm to find all possible combinations of a group of LEGOs?

Published on 07 Jun 2021 - 12:22

score 118 · Answer 7 · 2026-02-23 10:04:44

118

Views

For Desarguian projective planes, coordinatization is inverse to the $K \mapsto K\mathbf{P}^2$ construction

Published on 23 Feb 2026 - 10:04

score 144 · Answer 8 · 2026-03-29 03:12:23

144

Views

What are some good informal beginner level books for studying combinatorial geometry?

Published on 29 Mar 2026 - 3:12

score 40 · Answer 9 · 2021-06-21 13:34:46

40

Views

Minimal number of intersections of families of lines

Published on 21 Jun 2021 - 13:34

score 260 · Answer 10 · 2026-03-29 04:33:48

260

Views

IGO 2017 P4 of Combinatorial Geometry

Published on 29 Mar 2026 - 4:33

score 107 · Answer 11 · 2021-07-11 17:27:27

107

Views

Coloring squares on grid with constraints

Published on 11 Jul 2021 - 17:27

score 718 · Answer 12 · 2026-03-29 04:26:20

718

Views

Draw 7 lines on the plane in an arbitrary manner. Prove that for any such configuration, 2 of the those 7 lines form an angle less than 26◦

Published on 29 Mar 2026 - 4:26

score 43 · Answer 13 · 2026-03-26 07:58:53

43

Views

A combinatorial question on Steiner systems from book of Dixon-Mortimer

Published on 26 Mar 2026 - 7:58

score 128 · Answer 14 · 2026-03-29 04:11:05

128

Views

Is every polytope combinatorially isomorphic to the intersection of $\Delta_{n-1}$ with a linear space?

Published on 29 Mar 2026 - 4:11

score 188 · Answer 15 · 2021-08-10 06:19:29

188

Views

How can I arrange coloured triangles in hexagons so that they dont touch each other?

Published on 10 Aug 2021 - 6:19

List Question

Is there a closed form formula for counting 2-regular labelled graphs?

Geometric quantity related to $a^3 + b^3 + c^3$

What's the supremum of of the ratio of perimeter to diameter of a convex $n$-gon(for a given n)?

Is the honeycomb lattice the double graph of another graph?

Suppose we have $n$ points in a plane, not all on the same line. Then they are determining at least $n$ different lines.

Algorithm to find all possible combinations of a group of LEGOs?

For Desarguian projective planes, coordinatization is inverse to the $K \mapsto K\mathbf{P}^2$ construction

What are some good informal beginner level books for studying combinatorial geometry?

Minimal number of intersections of families of lines

IGO 2017 P4 of Combinatorial Geometry

Coloring squares on grid with constraints

Draw 7 lines on the plane in an arbitrary manner. Prove that for any such configuration, 2 of the those 7 lines form an angle less than 26◦

A combinatorial question on Steiner systems from book of Dixon-Mortimer

Is every polytope combinatorially isomorphic to the intersection of $\Delta_{n-1}$ with a linear space?

How can I arrange coloured triangles in hexagons so that they dont touch each other?

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