Sam Hopkins's user avatar
Sam Hopkins's user avatar
Sam Hopkins's user avatar
Sam Hopkins
  • Member for 11 years, 8 months
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7 votes
1 answer
593 views

Reciprocity for fans of bounded Dyck paths

7 votes
0 answers
245 views

Interesting uniform posets

7 votes
1 answer
387 views

Combinatorial reciprocity for symmetric functions

6 votes
0 answers
193 views

Filling in some missing squares for classes of power series

6 votes
1 answer
212 views

Fixed points for finitary distributive lattices bijection

6 votes
0 answers
312 views

Reference request: colored Motzkin path interpretation of Catalan numbers

6 votes
0 answers
274 views

Power law correction factor in tree enumeration via naïve division

6 votes
0 answers
128 views

Exact classifications of numerical sequences in combinatorics

6 votes
1 answer
442 views

Does the family of graphs closed under taking unions and adding dominating vertices have a name?

6 votes
1 answer
219 views

Extend space to make polyhedra convex hulls of finite sets

6 votes
0 answers
209 views

Hopf algebra interpretation of hypergraph duality?

6 votes
1 answer
197 views

How big can the index inside the root lattice of the lattice generated by a subset of roots be?

5 votes
1 answer
490 views

Combinatorial proof of the Cauchy identity for double Schubert polynomials

5 votes
1 answer
592 views

Number of regions of a hyperplane arrangement avoiding a generic hyperplane

5 votes
0 answers
395 views

Size of union of a set of subsets and its permutations

5 votes
0 answers
456 views

Computing adjacency matrix eigenvalues by counting closed walks

5 votes
0 answers
131 views

$q$-Kostant partition function and flow polytopes?

5 votes
0 answers
322 views

Determinantal formula for plane partitions of shifted shape

5 votes
1 answer
338 views

Bijectively counting labeled trees by number of leaves

5 votes
1 answer
213 views

Coefficients obtained from ratio with partition number generating function

5 votes
0 answers
187 views

Is this "trimming" of a supersolvable semimodular lattice known?

5 votes
0 answers
148 views

Combinatorial classes where not almost all objects are asymmetric

5 votes
0 answers
172 views

"Cluster algebra" structure for finite distributive lattices

5 votes
0 answers
225 views

What does the best die look like?

4 votes
0 answers
173 views

To whom is the classification of atomic, modular finite lattices due?

4 votes
1 answer
160 views

Lattice description of matroid duality

4 votes
1 answer
173 views

Denominators of rational polytopes in terms of hyperplane coefficients

4 votes
1 answer
142 views

$0,1$-matrices with $1$ in every row/column vs. all $0,1$-matrices

4 votes
1 answer
205 views

Integer-valued polynomials from Pólya counting

4 votes
1 answer
202 views

Map on class of all finite posets coming from maximal sized antichains