Richard Stanley's user avatar
Richard Stanley's user avatar
Richard Stanley's user avatar
Richard Stanley
  • Member for 14 years, 4 months
  • Last seen this week
5 votes

Number of regions created by r hyper-planes in n-dimensional space

9 votes
Accepted

Fixed points for finitary distributive lattices bijection

47 votes

Mathematicians who were late learners?-list

1 vote

Coefficients of 0,1-polynomials factorization

1 vote

Number of bi-directional (or symmetric edges)

5 votes

Closed formula for number of ones in a proper factor tree

12 votes
Accepted

A combinatorial identity involving increasing functions from $\{1, \dots, n\}$ to itself

3 votes

Expressions for binomial residue sum $\sum_{k=0}^n {n \choose k} x^k \left( \frac{k}{q} \right)$

4 votes

Compute/estimate the number of non-isomorphic graphs with $n$ nodes, $a$ edges, $b$ connected components

7 votes
Accepted

Largest antichain in partial ordering in OEIS

16 votes

Brute force open problems in graph theory

49 votes

Is all ordinary mathematics contained in high school mathematics?

15 votes

Is it possible to "get" quaternions without specifically postulating them?

2 votes
Accepted

Which simplicial complexes are completely determined by the 1-skeleton of their dual polyhedral complexes?

8 votes

Unimodality of sequence of number of subgroups in $p$-groups

6 votes
Accepted

Permutohedron and triangulation of cube via Eulerian numbers

28 votes

Applications of the Chinese remainder theorem

6 votes
Accepted

Seeking for a combinatorial argument for partition identities

4 votes
Accepted

Fibonacci and product polynomials

33 votes
Accepted

Linear algebra proofs in combinatorics?

7 votes
Accepted

Plane partitions as sums of determinants

11 votes
Accepted

Hilbert polynomials of graded algebras evaluated at negative numbers

9 votes
Accepted

An "incomplete" tiling?

13 votes

The factorials of -1, -2, -3, …

16 votes

Results from abstract algebra which look wrong (but are true)

62 votes

Examples of common false beliefs in mathematics

10 votes

What bijection on permutations corresponds under RS to transpose?

14 votes

What is the oldest open problem in mathematics?

53 votes

What's your favorite equation, formula, identity or inequality?

4 votes

Named sets of permutations

1
2 3 4 5
16