User Adam P. Goucher

47 votes

Accepted

Can we find lattice polyhedra with faces of area 1,2,3,...?

answered Apr 29, 2014 at 17:48

46 votes

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What's the bijection between reals and infinite sequences of integers?

answered May 20, 2021 at 21:02

36 votes

Does an existence of large cardinals have implications in number theory or combinatorics?

answered Mar 27, 2015 at 14:28

34 votes

Can one "hear" the shape of a polygon via external reflections?

answered Apr 19, 2018 at 13:15

32 votes

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Can a fixed finite-length straightedge and finite-size compass still construct all constructible points in the plane?

answered Jul 11, 2020 at 17:00

31 votes

Is there any theory why (for Bitcoin) the discrete logarithm problem is so hard to solve?

answered Nov 22, 2019 at 19:41

26 votes

Puzzle on deleting k bits from binary vectors of length 3k

answered Sep 22, 2013 at 20:02

25 votes

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A conjecture in which both "if" and "only if" are near misses

answered Nov 29, 2017 at 16:21

24 votes

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Rational inscribed realization of the regular dodecahedron

answered Jul 25, 2020 at 19:18

23 votes

What is the geometric shape of the Monster sporadic group?

answered Mar 23, 2020 at 10:30

23 votes

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A cubic and six conics problem

answered Feb 28, 2016 at 18:02

23 votes

Accepted

Presentation of the Monster Group

answered Sep 15, 2013 at 14:10

21 votes

Euler's constant: irrationality and proof theory

answered Nov 29, 2015 at 15:19

19 votes

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Vietoris-Rips complex homology of a higher degree than the ambient dimension

answered Jun 18, 2018 at 8:39

17 votes

Structures that turn out to exhibit a symmetry even though their definition doesn't

answered Dec 27, 2013 at 14:57

16 votes

Extremely messy proofs

answered Jul 17, 2014 at 0:59

16 votes

Accepted

Is there a simple description of this group?

answered May 6, 2015 at 15:39

15 votes

What is an explicit bijection in combinatorics?

answered Feb 22, 2019 at 11:30

15 votes

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Find all integer solutions to $y^2=x^5+4.$ Is it true that the only solutions are $(x, y) = \{( 2,-6), ( 2,6),(0,2), (0,-2) \}.$

answered Aug 24, 2017 at 12:26

14 votes

Do mathematical objects disappear?

answered Jan 21, 2016 at 16:32

14 votes

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Which distributions can you sample if you can sample a Gaussian?

answered May 2, 2014 at 22:36

14 votes

Accepted

Is there a set of positive integers of density 1 which contains no infinite arithmetic progression?

answered Jun 7, 2019 at 13:34

13 votes

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Exponential towers of $i$'s

answered May 8, 2020 at 12:14

13 votes

Accepted

Are there irregular tilings by L-polyominoes?

answered Jun 7, 2014 at 23:06

13 votes

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Polymath-type projects for textbooks?

answered Jan 15, 2018 at 14:51

11 votes

Unexpected occurrences of the Sierpinski triangle

answered Mar 19, 2016 at 17:19

11 votes

Accepted

Expected number of lines meeting four given lines or "what is 1.72..."

answered Jan 28, 2017 at 0:48

11 votes

What are examples of (collections of) papers which "close" a field?

answered Dec 4, 2019 at 19:28

10 votes

Decide if a matrix is transposable

answered Nov 14, 2018 at 18:27

10 votes

There is a 3-connected 5-regular simple $n$-vertex planar graph iff $n$ satisfies....?

answered Jul 21, 2020 at 13:57

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106 Answers

Can we find lattice polyhedra with faces of area 1,2,3,...?

What's the bijection between reals and infinite sequences of integers?

Does an existence of large cardinals have implications in number theory or combinatorics?

Can one "hear" the shape of a polygon via external reflections?

Can a fixed finite-length straightedge and finite-size compass still construct all constructible points in the plane?

Is there any theory why (for Bitcoin) the discrete logarithm problem is so hard to solve?

Puzzle on deleting k bits from binary vectors of length 3k

A conjecture in which both "if" and "only if" are near misses

Rational inscribed realization of the regular dodecahedron

What is the geometric shape of the Monster sporadic group?

A cubic and six conics problem

Presentation of the Monster Group

Euler's constant: irrationality and proof theory

Vietoris-Rips complex homology of a higher degree than the ambient dimension

Structures that turn out to exhibit a symmetry even though their definition doesn't

Extremely messy proofs

Is there a simple description of this group?

What is an explicit bijection in combinatorics?

Find all integer solutions to $y^2=x^5+4.$ Is it true that the only solutions are $(x, y) = \{( 2,-6), ( 2,6),(0,2), (0,-2) \}.$

Do mathematical objects disappear?

Which distributions can you sample if you can sample a Gaussian?

Is there a set of positive integers of density 1 which contains no infinite arithmetic progression?

Exponential towers of $i$'s

Are there irregular tilings by L-polyominoes?

Polymath-type projects for textbooks?

Unexpected occurrences of the Sierpinski triangle

Expected number of lines meeting four given lines or "what is 1.72..."

What are examples of (collections of) papers which "close" a field?

Decide if a matrix is transposable

There is a 3-connected 5-regular simple $n$-vertex planar graph iff $n$ satisfies....?