Martin Rubey's user avatar
Martin Rubey's user avatar
Martin Rubey's user avatar
Martin Rubey
  • Member for 14 years, 2 months
  • Last seen this week
27 votes

Is there any use for $\sin(\sin x)$?

21 votes

Exact formulas for the partition function?

16 votes

Nontrivial theorems with trivial proofs

12 votes
Accepted

Generalization's of Greene's Theorem for the Robinson-Schensted correspondence

11 votes

Whether a total order set of size $n$ has the fewest endomorphisms among posets of size $n$

9 votes

Examples of advance via good definitions

9 votes

What is an explicit bijection in combinatorics?

9 votes
Accepted

Is there a combinatorial interpretation of this array in terms of $S_{2n+1}$?

9 votes

What are some examples of interesting uses of the theory of combinatorial species?

9 votes
Accepted

Number of spanning trees in a grid

9 votes

What is the relationship between the Bell numbers, the Bell polynomials, and the partition numbers?

8 votes
Accepted

Is there a natural family of languages whose generating functions are holonomic (i.e. D-finite)?

8 votes
Accepted

Divisibility Relation for Spanning Trees of a Graph

8 votes
Accepted

How many permutations are there at a given Cayley distance from the identity?

8 votes

Is there a website or a survey collecting all NP-complete problems on graph theory?

7 votes
Accepted

Label distance number and chromatic number of a graph

7 votes
Accepted

Is there a bijection of permutations onto mathematical objects that preserve information about descents?

6 votes

Two statistics on the permutation group

6 votes
Accepted

Bijective proof of formula for rooted binary forests

5 votes

Hankel determinants for q-Catalan numbers where q is a root of unity?

5 votes
Accepted

The sum of an hydrogen atom related infinite series

5 votes
Accepted

Finding recurrence relation for a sequence of polynomials

5 votes

Connectivity graph invariant

4 votes

"Upside-down unimodal" sequences in combinatorics

4 votes

How does this relationship between the Catalan numbers and SU(2) generalize?

4 votes

Can you find linear recurrence relation for dimensions of invariant tensors?

4 votes

Help with a double sum, please

4 votes

An example of a series that is not differentially algebraic?

4 votes

can the Newton's identities and Dodgson's condensations be proved by Gessel-Viennot's lemma?

4 votes

Number of permutations inducing same order on consecutive elements