User Ed Pegg - Mathematics Stack Exchange

131 votes

0 answers

5k views

Mondrian Art Problem Upper Bound for defect

asked Dec 3, 2016 at 1:07

112 votes

5 answers

8k views

What is the smallest number of $45^\circ-60^\circ-75^\circ$ triangles that a square can be divided into?

asked Jun 11, 2011 at 0:34

38 votes

2 answers

14k views

The Scutoid, a new shape

asked Jul 27, 2018 at 21:53

26 votes

1 answer

629 views

The Caverns of Primitive Polynomial GF[2]

asked Feb 10, 2017 at 8:33

23 votes

2 answers

1k views

Complex solutions for Fermat-Catalan conjecture

asked Oct 2, 2011 at 17:19

23 votes

2 answers

1k views

Random Dental Floss Odds

asked Aug 29, 2018 at 5:28

22 votes

2 answers

2k views

What is the simplest ellipse that goes through exactly 13 lattice points?

asked Oct 2, 2011 at 18:44

21 votes

1 answer

3k views

Triangle dissection, no shared edges

asked Jun 9, 2016 at 16:57

21 votes

2 answers

784 views

Graceful graphs with Valence $k$

asked May 31, 2019 at 2:47

18 votes

1 answer

809 views

Golden Rectangle into Golden Rectangles

asked Mar 11, 2018 at 0:12

16 votes

2 answers

565 views

The Heegner Polynomials

asked Jan 17, 2018 at 18:37

16 votes

0 answers

561 views

What turmite runs the longest before becoming predictable?

asked Feb 8, 2013 at 18:58

14 votes

1 answer

1k views

Maximally touching toruses

asked Aug 15, 2013 at 19:10

14 votes

1 answer

1k views

Any other Caltrops?

asked Jan 7, 2016 at 1:23

14 votes

4 answers

1k views

Volume of 1/2 using hull of finite point set with diameter 1

asked Jan 17, 2016 at 21:38

14 votes

0 answers

524 views

Rolling Dodecahedron Path

asked Nov 24, 2019 at 14:59

13 votes

0 answers

643 views

3D Rep-tiles and Irreptiles

asked Jul 3, 2018 at 16:29

13 votes

2 answers

4k views

Possible all-Pentagon Polyhedra

asked Jan 12, 2016 at 20:47

12 votes

1 answer

790 views

Polyhedra with identical faces

asked Feb 22, 2016 at 23:29

12 votes

1 answer

1k views

Integer Triangle Radicals conjecture

asked Apr 28, 2016 at 20:49

12 votes

3 answers

2k views

Largest-area shape with diameter 1?

asked Jan 8, 2016 at 23:05

12 votes

1 answer

378 views

Biggest Little Polyhedron

asked Jul 1, 2013 at 21:37

12 votes

2 answers

350 views

Divide a square into rectangles where each occurs once in each orientation

asked Jan 17, 2017 at 17:05

12 votes

1 answer

414 views

What's special about 323 and squared rectangles?

asked Jul 10, 2017 at 19:53

12 votes

1 answer

1k views

Maximally dense Unit Distance Graphs

asked Dec 21, 2017 at 3:30

12 votes

1 answer

374 views

Heesch numbers in 3D

asked Feb 21, 2019 at 20:17

11 votes

1 answer

889 views

Fermat Point of a Tetrahedron

asked Jul 6, 2018 at 1:04

11 votes

0 answers

272 views

Points at Integer Distances in 3-space

asked Jan 24, 2013 at 6:12

11 votes

1 answer

3k views

Fractional oblongs in unit square via the Paulhus packing technique

asked Oct 30, 2015 at 15:13

10 votes

2 answers

1k views

Rolling icosahedron Hamiltonian path

asked Oct 26, 2018 at 17:07

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233 Questions

Mondrian Art Problem Upper Bound for defect

What is the smallest number of $45^\circ-60^\circ-75^\circ$ triangles that a square can be divided into?

The Scutoid, a new shape

The Caverns of Primitive Polynomial GF[2]

Complex solutions for Fermat-Catalan conjecture

Random Dental Floss Odds

What is the simplest ellipse that goes through exactly 13 lattice points?

Triangle dissection, no shared edges

Graceful graphs with Valence $k$

Golden Rectangle into Golden Rectangles

The Heegner Polynomials

What turmite runs the longest before becoming predictable?

Maximally touching toruses

Any other Caltrops?

Volume of 1/2 using hull of finite point set with diameter 1

Rolling Dodecahedron Path

3D Rep-tiles and Irreptiles

Possible all-Pentagon Polyhedra

Polyhedra with identical faces

Integer Triangle Radicals conjecture

Largest-area shape with diameter 1?

Biggest Little Polyhedron

Divide a square into rectangles where each occurs once in each orientation

What's special about 323 and squared rectangles?

Maximally dense Unit Distance Graphs

Heesch numbers in 3D

Fermat Point of a Tetrahedron

Points at Integer Distances in 3-space

Fractional oblongs in unit square via the Paulhus packing technique

Rolling icosahedron Hamiltonian path