FU Berlin

Associahedra Seminar

Winter Semester 2012/2013

This weekly seminar is currently organized by Cesar Ceballos and Jean-Philippe Labbé.
We discuss about associahedra and any related topics. Guests are always welcome to join.
If you are interested on giving a talk please send an email to ceballos@math.fu-berlin.de

Until July 2012, this seminar was organized together with Carsten Lange and Emerson León.

(Preliminary) schedule:

Location: FU math Villa, Arnimallee 2, seminar room 001
Mondays 10:00am (with some exceptions *)

Nov 8* Cesar Ceballos d-vectors of cluster algebras of finite type
Nov 12 Discussion session
Nov 19 Jean-Philippe Labbé SL_k tilings of the plane
Nov 26 Cesar Ceballos The Chapoton-Fomin-Zelevinsky generalized associahedra
Dec 3 Günter Ziegler Non-polytopal spheres
Dec 6* Vincent Pilaud Vertex barycenter of generalized associahedra
Dec 13* Karim Adiprasito Combinatorial topology of spheres
Dec 17 Francisco Santos Constructing the multi-associahedron: some ideas that did not work

Sommer Semester 2012

This semester, the seminar is also the Forschungsseminar on Polyhedral Combinatorics .

Schedule:

April 24 Cesar Ceballos Realizing spherical subword complexes - an equivalent problem
April 30* Carsten Lange Counting c-singletons
May 8 Jean-Philippe Labbé The greedy flip algorithm for subword complexes
May 15 Jean-Philippe Labbé The complex of non-crossing diagonals of a polygon
May 22 Raman Sanyal A spherical initial ideal for Pfaffians
May 29 Emerson León The tropical totally positive Grassmannian
June 5 Cesar Ceballos A Coalgebra of subword complexes
June 12 Carsten Lange Lattice quotients and Hopf algebras
June 19 Katharina Jochemko Lattice quotients and Hopf algebras
June 26* Cesar Ceballos Brick polytopes of spherical subword complexes
July 24 Jean Philippe Labbé Multi-cluster complexes

Winter Semester 2011-2012

Schedule:

Christian Stump
Tuesday November 8, 2011 - 10:00 am
Title: The Reading-Speyer approach to sortable elements
Jean-Philippe Labbé
Tuesday November 1, 2011 - 10:00 am (Sharp!)
Title: Generalized cluster complexes
Christian Stump
Thursday October 20, 2011 - 2:15 pm (Discrete Geometry Seminar)
Title: A new approach to generalized associahedra
Cesar Ceballos
Thursday October 13, 2011 - 10:15 am
Title: Cluster algebras
Jean-Philippe Labbé
Thursday October 6, 2011 - 10:15 am
Title: Generalized cluster complexes
Cesar Ceballos
Thursday September 29, 2011 - 10:15 am
Title: Subword complexes, cluster complexes and generalized multiassociahedra

Summer Semester 2011

Schedule:

Carsten Lange
Monday July 25, 2011 - 10:00 am
Title: Hohlwe-Lange-Thomas realizations of generalized associahedra
Carsten Lange
Thursday July 21, 2011 - 2:15 pm (Discrete Geometry Seminar)
Title: Minkowski decompositions of associahedra
Cesar Ceballos
Thursday June 9, 2011 - 10:00 am
Title: The brick polytope
Jean-Philippe Labbé
Thursday May 26, 2011 - 2:15 pm (Discrete Geometry Seminar)
Title: Subword complexes and multiassociahedra
Carsten Lange
Wednesday May 25, 2011 - 10:00 am
Title: The brick polytope
Jean-Philippe Labbé
Wednesday April 20, 2011 - 10:00 am
Title: Bijection between k-fans of Dyck Paths and k-triangulations of a convex n-gon
Jean-Philippe Labbé
Friday April 8, 2011 - 10:00 am
Title: Bijection between k-fans of Dyck Paths and k-triangulations of a convex n-gon