Brian Hopkins's user avatar
Brian Hopkins's user avatar
Brian Hopkins's user avatar
Brian Hopkins
  • Member for 12 years, 11 months
  • Last seen this week
50 votes

Two-colouring the two-sphere

49 votes
Accepted

Is there winning strategy in Tetris ? What if Young diagrams are falling?

24 votes
Accepted

When do binomial coefficients sum to a power of 2?

22 votes

The use of computers leading to major mathematical advances II

15 votes

Conway's lesser-known results

14 votes

Counterexamples against all odds

11 votes

A bijection between sets of Young tableaux of two kinds

10 votes

Expected cardinality of a randomly chosen element of the family of subsets of $\{1,\ldots,n\}$ with at most $k$-elements

10 votes
Accepted

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

10 votes
Accepted

Sidon sets with k >1

9 votes

Origin and variations of problem on $4xy-x-y$ being square

8 votes

Your favorite surprising connections in mathematics

8 votes
Accepted

Euclid's algorithm as a combinatorial game

7 votes
Accepted

Fibonacci, compositions, history

7 votes

Software and ideas for workshops and conferences with long-distance participants

6 votes

Plane partitions with equal margins

6 votes

Combinatorics: on the number of Celtic knots in an n × m frame

6 votes

Papers on history and philosophy of mathematics suitable for master's students

6 votes

Number of d-Calabi-Yau partitions

5 votes
Accepted

Why is a dynamical system not a dynamic system?

5 votes

Golden ratio in contemporary mathematics

5 votes

Which popular games have been studied mathematically?

5 votes

Closed formula for $(-1)$-Baxter sequences

5 votes

Least number of vertices in a graph with which one can uniquely recover some partition of N

5 votes

4-polytopes with only one kind of regular facet

5 votes

Is the "Moebius Stairway" Graph Already Known?

5 votes

Research-level mathematical bookstores

4 votes

Hamiltonian paths where the vertices are integer partitions

4 votes

Definition of the Gauss symbol

4 votes

Modern results that are widely known, yet which at the time were ignored, not accepted or criticized