User Tony Huynh

17 votes

Verifying the correctness of a Sudoku solution

answered Apr 30, 2013 at 0:30

17 votes

A weaker version of the ABC conjecture

answered Nov 12, 2012 at 13:53

17 votes

Accepted

Can all crossings in a graph be moved to one point?

answered Jan 17, 2017 at 19:11

17 votes

Accepted

Is every 1-million-connected graph rigid in 3D?

answered May 10, 2021 at 2:22

16 votes

How many integers are of the form $n/d(n)$, where $d(n)$ is the number of divisors of $n$?

answered Jun 2, 2014 at 20:13

16 votes

Is there a dense subset of the real plane with all pairwise distances rational?

answered Mar 23, 2010 at 17:58

15 votes

Are all almost regular graphs obvious?

answered May 27, 2014 at 15:44

15 votes

A function that is defined everywhere but has unknown values

answered Sep 14, 2012 at 12:00

15 votes

Is every graph an edge-crossing graph?

answered Apr 12, 2015 at 22:30

15 votes

Choosing two-colorable subgraph in a triangulation

answered Apr 29, 2016 at 10:58

15 votes

Accepted

Approximate size of the image of functions $f:[n]\to[n]$

answered Feb 19, 2023 at 21:38

14 votes

Current state of the Komlos conjecture on vector balancing

answered Jul 11, 2017 at 4:17

14 votes

Accepted

Hard maths on viXra?

answered Feb 4, 2016 at 1:32

14 votes

Cube-free infinite binary words

answered Apr 12, 2011 at 10:05

14 votes

What are some good examples of non-monotone graph properties?

answered Sep 28, 2010 at 0:46

13 votes

A set for which it is hard to determine whether or not it is countable.

answered Mar 22, 2011 at 12:55

13 votes

Experimental mathematics leading to major advances

answered Mar 5, 2010 at 16:21

13 votes

Parity of $\lfloor 1/(x y) \rfloor$ not equally distributed

answered Oct 19, 2014 at 2:47

13 votes

Accepted

Maximum matching in a graph with no "shortcuts"

answered Mar 8, 2017 at 18:04

13 votes

Accepted

Berge-Fulkerson conjecture --- the planar case

answered Aug 16, 2021 at 0:25

12 votes

Accepted

Are polynomials bounded on the primes possible?

answered Oct 22, 2020 at 14:58

12 votes

Visibility of vertices in polyhedra

answered Jun 8, 2014 at 14:16

12 votes

Accepted

Is every knot unavoidable in the embeddings of some graph?

answered Jul 15, 2014 at 13:07

12 votes

What advantage humans have over computers in mathematics?

answered Mar 13, 2016 at 11:30

12 votes

Three-halves-free words (analogous to square-free)

answered Apr 7, 2015 at 13:46

12 votes

Accepted

Interesting applications of max-flow and linear programming

answered Feb 17, 2010 at 22:32

12 votes

Accepted

Good introductory text book on Matroid Theory?

answered Jun 14, 2011 at 11:08

12 votes

A good book of functional analysis

answered Aug 9, 2011 at 3:05

12 votes

Accepted

Existence of triangle-free graphs for regular graphs of degree at most n/2

answered Dec 10, 2010 at 14:55

12 votes

Classes of graphs for which isospectrum implies isomorphism?

answered Dec 13, 2010 at 12:57

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475 Answers

Verifying the correctness of a Sudoku solution

A weaker version of the ABC conjecture

Can all crossings in a graph be moved to one point?

Is every 1-million-connected graph rigid in 3D?

How many integers are of the form $n/d(n)$, where $d(n)$ is the number of divisors of $n$?

Is there a dense subset of the real plane with all pairwise distances rational?

Are all almost regular graphs obvious?

A function that is defined everywhere but has unknown values

Is every graph an edge-crossing graph?

Choosing two-colorable subgraph in a triangulation

Approximate size of the image of functions $f:[n]\to[n]$

Current state of the Komlos conjecture on vector balancing

Hard maths on viXra?

Cube-free infinite binary words

What are some good examples of non-monotone graph properties?

A set for which it is hard to determine whether or not it is countable.

Experimental mathematics leading to major advances

Parity of $\lfloor 1/(x y) \rfloor$ not equally distributed

Maximum matching in a graph with no "shortcuts"

Berge-Fulkerson conjecture --- the planar case

Are polynomials bounded on the primes possible?

Visibility of vertices in polyhedra

Is every knot unavoidable in the embeddings of some graph?

What advantage humans have over computers in mathematics?

Three-halves-free words (analogous to square-free)

Interesting applications of max-flow and linear programming

Good introductory text book on Matroid Theory?

A good book of functional analysis

Existence of triangle-free graphs for regular graphs of degree at most n/2

Classes of graphs for which isospectrum implies isomorphism?