Fiedler pencils are a family of matrix pencils which generalizes the well-known companion matrix: they are *linearizations*, i.e., they provide a method to construct, given a matrix polynomial, a linear eigenvalue problem with the same eigenvalues…
Eventi
Liouville-type problems on compact surfaces: a variational approach – Aleks Jevnikar
A class of Liouville equations and systems on compact surfaces is considered: we focus on the Toda system which is motivated in mathematical physics by the study of models in non-abelian Chern-Simons theory and in geometry in the description of…
Non-local Isoperimetric Problems – François Generau (Université de Grenoble)
Venue Sala Seminari (Dip. Matematica). Abstract…
Morfismo traccia e deformazioni di coppie (varieta’, fascio coerente). – Marco Manetti (Universita\’ di Roma “La Sapienza”)
Dato un fascio coerente F su una varieta’ liscia proiettiva X, viene determinata l’algebra di Lie differenziale graduata che controlla le deformazioni della coppia (X,F). Viene poi introdotto un morfismo di traccia tra opportuni fasci di operatori…
Backward error analysis for polynomial rootfinders – Leonardo Robol (ISTI–CNR Pisa)
The most common methods to compute roots of polynomials is to rephrase the problem in linear algebra terms: one constructs a companion matrix (or pencil) that has the roots of the polynomial as eigenvalues. However, even when the eigenvalue method…
On corks with low shadow-complexity – Hironobu Naoe (Tohoku University, Japan)
A cork is a contractible Stein domain that gives arise to exotic pairs of 4-manifolds. The first example was found by Akbulut. It is known that any two exotic, simply-connected, closed 4-manifolds are related by a cork twist. We show that there are…
Moduli of curves with principal and spin bundles: singularities and global geometry – Mattia Galeotti (Universite\’ “Pierre et Marie Curie”, Parigi)
Abstract: In a series of recent papers, Chiodo, Farkas and Ludwig carried out a deep analysis of the singular locus of the moduli space of stable (twisted) curves with an l-torsion line bundle. They showed that for l ≤ 6 and different from 5…