Combinatorial Geometries: matroids, oriented matroids and applications

Marseille-Luminy, April Tuesday 2 - Saturday 6, 2013

Dedicated to the memory of Michel Las Vergnas

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SCHEDULE
(click on the title to get to the abstract)

Tuesday 2
8h30REGISTRATION
9hJim LAWRENCE Radon Catalogs, the Odd-Even Invariant, and Valuations
9h45Hans-Jürgen BANDELTGeometry of lopsided sets
10h30BREAK
11hKolja KNAUERBetween partial cubes and oriented matroids
11h45Matjaz KOVSETutte polynomials and topological representations of partial cubes
12h30LUNCH
14h30András RECSKITree decomposition, tree orientation and rigid frameworks
15h15Antoine DEZAA combinatorial approach to colourful simplicial depth
16hBREAK
16h30Federico ARDILAMatroids in tropical geometry
17h15Felipe RINCONTropical linear spaces and valuated matroids
19h30DINNER
Wednesday 3
8h45Komei FUKUDAMy personal memories of Michel and his work
9hRichard POLLACKDouble Permutation Sequences and Arrangements of Planar Families of Convex Sets with Applications
9h45Ricardo STRAUSZApplying the probabilistic method to Separoids theory
10h30BREAK
11hCsongor CSEHIThe graphicity of the sum of graphic matroids
11h45Viet Hang NGUYENInductive construction and decomposition of graded sparse graphs
12h30LUNCH
19h30DINNER
Thursday 4
9hLouis BILLERAUnbalanced collections, weak maps and a problem in quantum physics
9h45Michel POCCHIOLAArrangements of double pseudolines living in non orientable surfaces
10h30BREAK
11hAndreas HOLMSENRealization spaces and Erd\H{o}s-Szekeres theorems for convex sets
11h45Arnau PADROLFrom Ehrhart theory to the discrepancy of oriented matroids
12h30LUNCH
14h30Jürgen BOKOWSKIOriented Matroids and Configurations of Points and Lines
15h15Hiroyuki MIYATAComplete Enumeration of Small Realizable Oriented Matroids
16hBREAK
16h30Hidefumi HIRAISHIMinimal non-orientable matroids of rank $3$
17h15Carsten LANGECounting invariants for realizations of associahedra
19h30DINNER
20h45Emeric GIOANMichel's slides
21hJorge RAMIREZ ALFONSINMichel's conjectures
21h15WINE & CHEESE
Friday 5
9hJoseph KUNGThe Tutte polynomial as a resultant force
9h45Caroline KLIVANSCellular matroids
10h30BREAK
11hLuca MOCIMatroids over a ring
11h45Nikolai MNEVLocal combinatorial formula for the Chern class of combinatorial $S^1$ bundles
12h30LUNCH
14h30Emanuele DELUCCHIFoundations for a theory of phased matroids
15h15Thomas ZASLAVSKYPhased Matroids from Gain Graphs
16hBREAK
16h30Laura ANDERSONRealization spaces of phased matroids and the phased matroid Grassmannian
17h15Hiroshi HIRAIDiscrete Convexity and Polynomial Solvability in Minimum 0-extension Problems
19h30DINNER (BOUILLABAISSE)
Saturday 6
9hZoltán SZIGETIPacking of arborescences with matroid constraints
9h45Jérémie CHALOPINA topological characterization of basis graphs of matroids
10h30BREAK
11hKenjiro TAKAZAWAShortest Bibranchings and Valuated Matroid Intersection
11h45Olivier DURAND DE GEVIGNEYPacking of Count Matroids Basis
12h30LUNCH