Institute of
Discrete Mathematics and Geometry



Arbeitsgemeinschaft Diskrete Mathematik

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

Die Arbeitsgemeinschaft findet im Sommersemester an der TU Wien statt.

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

Aktueller Termin



Zeit: Dienstag, 15:15-16:45 Uhr,

Datum: 18.06.2024



Titel 1: "Enumeration of perfect matchings of cellular graphs"
Vortragende: Veronika Schreitter
Inhalt: A graph is cellular if it is bipartite, its edges can be partitioned into 4-cycles and its vertices all have degree 2 or 4. Using alternating sign patterns, Mihai Ciucu proved in 1996 that the number of matchings of such a graph is a power of 2 (which can be easily read off the graph) times the number of matchings of the graph we obtain by deleting all vertices of degree 2. I will present a slightly generalised version of this theorem and prove it using the same ideas as Ciucu does. Finally, I will present the classical application (also done by Ciucu) of this theorem, namely the enumeration of domino tilings of the Aztec Diamond.



Titel 2: "Background to the Razumov-Stroganov (Ex-)Conjecture"
Vortragende: Christian Theiner
Inhalt: Fully packed loops are certain finite subgraphs of the Z^2-grid. One wouldn't expect to find parallels to an infinite mathematical object like a tiling of a semi-infinite cylinder. In this talk we will learn about some properties of the two objects and use probability theory to see that they are comparable when talking about noncrossing matchings.


 

Vorträge in früheren Jahren

Übersicht: Vorträge Zeitraum 2005 - 2023


Bereits gehaltene Vorträge

Datum: 11.06.2024
Titel: "Popescu's nested approximation theorem for polynomial systems with one catalytic variable"
Vortragender: Gregor Böhm

Datum: 04.06.2024
Titel: "Enumeration of unlabelled chordal graphs with bounded tree-width"
Vortragender: Clément Requilé (UPC)

Datum: 28.05.2024
Titel: "Unimodal sequences and mixed modularity"
Vortragender: Robert Osburn (University College Dublin)

Datum: 14.05.2024
Titel: "Additive decomposability of multiplicative subsemigroups of the integers"
Vortragender: Pierre Bienvenu (TU Wien)

Datum: 30.04.2024
Titel: "Automorphic Mappings and Congruence Families"
Vortragender: Nicolas Smoot (Univ. Wien)

Datum: 23.04.2024
Titel: "Broadcasting-induced colorings of preferential attachment trees"
Vortragender: Colin Desmarais (Univ. Wien)

Datum: 16.04.2024
Titel: "Combinatorics of nondeterministic walks"
Vortragender: Michael Wallner (TU Wien)

Datum: 09.04.2024
Titel: "Badly approximable vectors and best approximation"
Vortragender: Nikolay Moshchevitin (TU Wien)

Datum: 12.03.2024
Titel: "Bigraded rings and major/descent indices"
Vortragender: Balázs Szendroi (Univ. Wien)

Datum: 05.03.2024
Titel: "The Rogers-Ramanujan Identities and Ariki-Koike Algebras"
Vortragender: Ae Ja Yee (Penn State University)

Datum: 27.02.2024
Titel: "The critical beta-splitting tree"
Vortragender: Svante Janson (Univ. Uppsala)

Datum: 30.01.2024
Titel: "Refined counting of distinct partitions and Rogers-Ramanujan type identities"
Vortragender: Shishuo FU (Chongqing University)

Datum: 23.01.2024
Titel: "Algebraicity of Hypergeometric Functions with Arbitrary Parameters"
Vortragender: Florian Fürnsinn (Universität Wien)

Datum: 16.01.2024
Titel: "The feedback arc set problem on some surface graphs"
Vortragender: Vera Vertesi (Universität Wien)

Datum: 09.01.2024
Titel: "Rowmotion, Promotion and Homomesy via Toggleability Statistics"
Vortragender: Tamas Hausel (IST Austria)

Datum: 12.12.2023
Titel: "Higgs bundle tournaments"
Vortragender: Tamas Hausel (IST Austria)

Datum: 05.12.2023
Titel: "Smith Normal Form in Combinatorics"
Vortragender: Patrick Kotsch (Universität Wien)

Datum: 28.11.2023
Titel: "Unimodular Valuations beyond Ehrhart"
Vortragender: Martin Rubey (TU Wien)

Datum: 21.11.2023
Titel: "Four decorated Ferrers diagrams and Schmidt-type partition identities"
Vortragender: Ali K. Uncu (Univ. of Bath and RICAM)

Datum: 07.11.2023
Titel: "Disemisimple Lie algebras and Pre-Lie and Post-Lie algebra structures"
Vortragender: Dietrich Burde (Univ. Wien)

Datum: 31.10.2023
Titel: "Components of large meandric systems and the infinite noodle"
Vortragender: Paul Thévenin (Univ. Wien)

Datum: 24.10.2023
Titel: "Partitions, Congruence Ideals, and the Localization Method"
Vortragender: Nicolas Smoot (Univ. Wien)

Datum: 17.10.2023
Titel: "(Elliptic) $A_n$ Selberg integrals"
Vortragender: Seamus Albion (Univ. Wien)

Datum: 10.10.2023
Titel: "An elliptic extension of the multinomial theorem"
Vortragender: Michael Schlosser (Univ. Wien)