Fakultäten der RUB » Fakultät für Mathematik » Lehrstühle » Algebraische Kombinatorik

2020

Organisation eines

Combinatorial Coworkspace
8.-15. März 2020, Kleinwalsertal, Österreich

gemeinsam mit Martina Juhnke-Kubitzke (Osnabrück), Thomas Kahle (Magdeburg), Raman Sanyal (Frankfurt)



2019

Vortrag im

AG AlgKomb Lunch Seminar
Mittwoch, 4. Dezember 2019, 12:15 - 13:15, IB 2/141

Jonathan Kliem (Berlin)
A face iterator for polyhedra

Abstract: We discuss a new algorithm that iterates over all elements of a meet-semilattice, where every interval is coatomic.



Vortrag im

AG AlgKomb Lunch Seminar
Mittwoch, 6. November 2019, 12:15 - 13:15, IB 2/141

Robert Löwe (Berlin)
Computing the discriminant of a quaternary cubic form

Abstract: We determine the 166104 extremal monomials of the discriminant of a quaternary cubic form. These are in bijection with D-equivalence classes of regular triangulations of the 3-dilated tetrahedron. We describe how to compute these triangulations and their D-equivalence classes in order to arrive at our main result.
The computation poses several challenges, such as dealing with the sheer number of triangulations effectively, as well as devising a suitably fast algorithm for computation of a D-equivalence class. This is joint work with Lars Kastner.



Organisation des

Workshop on Hyperplane Arrangements and Reflection Groups
23.-27. September 2019, Hannover, Deutschland

gemeinsam mit Michael Cuntz (Hannover), Gerhard Röhrle (Bochum)



Organisation des

83rd Séminaire Lotharingien de Combinatoire
1.-4. September 2019, Bad Boll, Deutschland

gemeinsam mit Christian Krattenthaler (Wien)