Carissimi,

vi ricordo i due seminari di Alex Suciu e Stefan Papadima.

Un saluto,

Filippo

SEMINARIO DI ALGEBRA, TOPOLOGIA E COMBINATORIA

GIOVEDI' 29 MAGGIO 2014 16:00-17:00, Sala Riunioni (Dip. Matematica) Alex Suciu (Northeastern University, Boston) Combinatorial covers, abelian duality, and propagation of resonance

ABSTRACT: We revisit and generalize a result of Eisenbud, Popescu, and Yuzvinsky, which says that the resonance varieties of a hyperplane arrangement complement propagate. It turns out that the topological underpinning for this phenomenon is a certain abelian duality property, coupled with the minimality property enjoyed by arrangement complements and related spaces, such as Cohen-Macaulay toric complexes. The key ingredient in the proof is a general, cohomological vanishing result for spaces that admit suitable `combinatorial' covers.

This is joint work with Graham Denham and Sergey Yuzvinsky.

SEMINARIO DI ALGEBRA, TOPOLOGIA E COMBINATORIA

GIOVEDI' 29 MAGGIO 2014 17:00-18:00, Sala Riunioni (Dip. Matematica) Stefan Papadima (IMAR) Milnor fibrations of arrangements and modular inequalities

ABSTRACT: A central question in the theory of complex hyperplane arrangements is to determine whether the characteristic polynomial of the algebraic monodromy acting on the rational homology of the associated Milnor fiber may be described solely in terms of the underlying combinatorics. I will discuss an approach based on the associated resonance varieties in positive characteristic.

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Il programma completo dei seminari si trova alla pagina: http://www.dm.unipi.it/~gaiffi/homepageseminario/ Sulla pagina è anche possibile scaricare le slides dei precedenti seminari.