Institute of
Discrete Mathematics and Geometry



Arbeitsgemeinschaft Diskrete Mathematik

Info: Das Seminar AGDM wird gemeinsam mit Kollegen der Universität Wien veranstaltet.

Ort: TU-Wien, Freihaus (4., Wiedner Hauptstraße 8-10), Dissertantenraum, grüner Turm (A), 8. Stock.


Aktueller Termin



Zeit: Dienstags, 15.15 - 16.45h,

Datum: 11.12.2018
Titel: "Steep-bounce zeta map in parabolic Cataland"
Vortragender: Wenjie Fang (TU Graz)



Inhalt: As a classical object, the Tamari lattice has many generalizations, including ν-Tamari lattices and parabolic Tamari lattices. In this talk, we unify these generalizations in a bijective fashion. We introduce a new combinatorial object called “left-aligned colored tree”, and show that it provides a bijective bridge between various parabolic Catalan objects and certain nested pairs of Dyck paths. Under these bijections, that parabolic Tamari lattices are proved to be isomorphic to ν-Tamari lattices for bounce paths ν. As another consequence of our bijections, we prove the Steep-Bounce conjecture using a generalization of the famous zeta map in q,t-Catalan combinatorics. This is a joint work with Cesar Ceballos and Henri Mühle.


 

Vorträge in früheren Jahren

Übersicht: Vorträge Zeitraum 2005 - 2018


Bereits gehaltene Vorträge

Datum: 27.11.2018
Titel: "Mahonian-Stirling pairs of combinatorial statistics for labeled forests"
Vortragende: Svetlana Poznanovikj (Clemson University)

Datum: 20.11.2018
Titel: "Perfect $k$-colored matchings and $k+2$-gonal tilings"
Vortragende: Lukas Andritsch (Univ. Graz)

Datum: 13.11.2018
Titel: "Fishburn family and Euler--Stirling statistics"
Vortragende: Emma Yu Jin (TU Wien)

Datum: 6.11.2018
Titel: "Enumeration problems related to computational models"
Vortragende: Katarzyna Grygiel (TU Wien)

Datum: 23.10.2018
Titel: "On some elementary polynomial identites Involving q-trinomial coefficients"
Vortragende: Alexander Berkovich (University of Florida)

Datum: 16.10.2018
Titel: "Alternating sign matrices and a constant term approach"
Vortragende: Ilse Fischer (Univ. Wien)

Datum: 9.10.2018
Titel: "The Operator Formula for Monotone Triangles: A Combinatorial Approach"
Vortragende: Hans Höngesberg (Univ. Wien)