User Ed Pegg - Mathematics Stack Exchange

57 votes

Accepted

Results that came out of nowhere.

answered Jan 15, 2013 at 2:42

26 votes

How to entertain a crowd with mathematics?

answered Apr 25, 2013 at 20:04

20 votes

Is it possible to be a mathematician without being mathematically talented?

answered Oct 3, 2011 at 4:03

19 votes

Unexpected approximations which have led to important mathematical discoveries

answered Jun 20, 2013 at 18:24

19 votes

What's the closest approximation to $\pi$ using the digits $0-9$ only once?

answered Jan 4, 2018 at 3:04

17 votes

Calculating the probability of a coin falling on its side

answered Oct 3, 2011 at 1:09

15 votes

What are some examples of when Mathematics 'accidentally' discovered something about the world?

answered Jun 1, 2016 at 16:30

14 votes

Research topics in combinatorics

answered Apr 24, 2013 at 2:10

14 votes

Why is it important to study combinatorics?

answered May 6, 2013 at 16:34

12 votes

Tiling pentominoes into a 5x5x5 cube

answered Oct 3, 2011 at 3:24

12 votes

Accepted

Rolling icosahedron Hamiltonian path

answered Nov 1, 2018 at 22:27

11 votes

Primes of the form $n^2+1$ - hard?

answered Oct 2, 2011 at 21:38

10 votes

Prove that Petersen's graph is non-planar using Euler's formula

answered Mar 20, 2014 at 20:07

10 votes

Accepted

$1^2+2^2+\cdots+24^2=70^2$ and squarily squaring the torus

answered Jan 13, 2015 at 22:57

9 votes

What are the odds of rolling a 3 number straight throwing 6d6

answered Oct 2, 2011 at 3:04

9 votes

Accepted

How many times can 100 people be split into 25 groups of 4 so that no one is in a group with the same person twice?

answered Apr 24, 2012 at 19:02

8 votes

Which side has winning strategy in Go?

answered Dec 27, 2012 at 19:22

8 votes

Graph Theory book with lots of Named Graphs/ Graph Families

answered Jan 9, 2015 at 18:39

8 votes

Accepted

Does this graph have a special name? (8-connected neighborhood)

answered Dec 20, 2013 at 22:21

8 votes

Accepted

Determine all convex polyhedra with $6$ faces

answered Jun 24, 2017 at 20:01

8 votes

What's the maximum number of faces a convex polyhedron can have, given that it's polyhedron with all the same faces?

answered Mar 16, 2016 at 20:24

8 votes

Is linear algebra more “fully understood” than other maths disciplines?

answered Mar 16, 2016 at 21:36

7 votes

Accepted

Covering eleven dots in the plane with eleven coins - counterexample?

answered Nov 9, 2015 at 23:55

7 votes

Frame challenge: Find the maximum $n$ such that circles of radius $1, \frac12, \frac13, ..., \frac1n$ can be held immobile by a convex frame.

answered Jan 15, 2023 at 17:20

6 votes

Accepted

Doubling the cube with unit sticks

answered Mar 11, 2018 at 6:46

6 votes

Find a succinct problem whose solution requires methods from many sub-branches of mathematics

answered Mar 16, 2016 at 22:09

6 votes

Accepted

Biggest Little Polyhedron

answered Mar 20, 2015 at 20:26

5 votes

Accepted

Has anyone discovered a convex space-filling 15-faced polyhedron?

answered Jun 22, 2013 at 0:45

5 votes

A problem about the largest prime factor of $n^2+1$

answered Jun 25, 2013 at 14:05

5 votes

Accepted

Why is $\arccos(-\frac 13)$ the optimal angle between bonds in a methane ($\rm CH_4$) molecule?

answered Mar 23, 2016 at 17:24

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182 Answers

Results that came out of nowhere.

How to entertain a crowd with mathematics?

Is it possible to be a mathematician without being mathematically talented?

Unexpected approximations which have led to important mathematical discoveries

What's the closest approximation to $\pi$ using the digits $0-9$ only once?

Calculating the probability of a coin falling on its side

What are some examples of when Mathematics 'accidentally' discovered something about the world?

Research topics in combinatorics

Why is it important to study combinatorics?

Tiling pentominoes into a 5x5x5 cube

Rolling icosahedron Hamiltonian path

Primes of the form $n^2+1$ - hard?

Prove that Petersen's graph is non-planar using Euler's formula

$1^2+2^2+\cdots+24^2=70^2$ and squarily squaring the torus

What are the odds of rolling a 3 number straight throwing 6d6

How many times can 100 people be split into 25 groups of 4 so that no one is in a group with the same person twice?

Which side has winning strategy in Go?

Graph Theory book with lots of Named Graphs/ Graph Families

Does this graph have a special name? (8-connected neighborhood)

Determine all convex polyhedra with $6$ faces

What's the maximum number of faces a convex polyhedron can have, given that it's polyhedron with all the same faces?

Is linear algebra more “fully understood” than other maths disciplines?

Covering eleven dots in the plane with eleven coins - counterexample?

Frame challenge: Find the maximum $n$ such that circles of radius $1, \frac12, \frac13, ..., \frac1n$ can be held immobile by a convex frame.

Doubling the cube with unit sticks

Find a succinct problem whose solution requires methods from many sub-branches of mathematics

Biggest Little Polyhedron

Has anyone discovered a convex space-filling 15-faced polyhedron?

A problem about the largest prime factor of $n^2+1$

Why is $\arccos(-\frac 13)$ the optimal angle between bonds in a methane ($\rm CH_4$) molecule?