Séminaire Lotharingien de Combinatoire, B94pref (2025), 1 p.

Christian Stump

Preface

The 94th meeting of the Séminaire Lotharingien de Combinatoire took place from September 14 to September 17, 2025, already for the fourth time at the beautiful Evangelische Akademie in Bad Boll (Germany) at the foot of the Schwäbischen Alb.

Once again, we enjoyed two great lecture series, this time mostly about a structure we all appreciate very much: polynomials.

Matt BECK (San Francisco State University) introduced us to the world of "q-Ehrhart polynomials" as recently introduced by Chapoton. We were presented various versions of Brion's Theorem of point counts in lattice polytopes and fascinating new research directions. Jang-Soo KIM (Sungkyunkwan University, Suwon) developed in the second lecture series the "Combinatorics of Orthogonal Polynomials", with many examples and combinatorial counting arguments, and a nice picture with Sylvie Corteel after a great breakthrough on lecture hall tableaux.

The topics of the contributed talks are detailed in the list below. We once again very much enjoyed the atmosphere, the friendly staff, and the surrounding hills and villages.

Contributed talks:

Drew ARMSTRONG: Brion's theorem and q-Catalan numbers

Benjamin DEQUÊNE: Rainbow meanders on Dyck paths

Benedek DOMBOS: Grounded partitions at level 2

David GARBER: On the Schur-positivity of set partitions

Elena HOSTER: Real-Rooted Chow Polynomials

Aryaman JAL: Non-nesting rook placements: matroids, thin posets and log-concavity

Jihyeug JANG: Andrews-Gordon and Stanton type identities: bijective and Bailey lemma approaches

Viktória KLÁSZ: Auslander regularity and Coxeter matrices for incidence algebras of lattices

Markus KLEINAU: Quiver representations over the field with one element

Diego ROBAYO: Divisors on graphs and tropical admissible covers

Michael SCHLOSSER: A bilateral extension of the Ramanujan function

Ludovic SCHWOB: Middle orders: all distributive lattices between weak and Bruhat orders

Nicolas Allen SMOOT: Multiplicities Between Modular Congruences

Diogo SOARES: On the Number of Shellable Arrangements of Pseudolines

Eleni TZANAKI: On the bond lattice of complete bipartite graphs

Zafeirakis ZAFEIRAKOPOULOS: Using Polyhedral Omega for Integer Partition Problems

List of Participants: