Il filling di Dehn è un importante metodo per costruire 3-varietà iperboliche chiuse a partire da 3-varietà iperboliche di volume finito. Questa costruzione ha un analogo algebrico per gruppi relativamenteiperbolici, e ne studieremo l’effetto sul…
Eventi
A variational approach to nonlocal and crystalline curvature flows – Marcello Ponsiglione (Università di Roma La Sapienza)
In this seminar I will introduce a generalized notion of (local and nonlocal) perimeter and curvature. Then, I will describe the corresponding geometric flows, showing the coherence between variational methods (based on the minimizing movements…
Newton’s method as an unexpectedly efficient root finder – Dierk Schleicher (Jacobs University, Bremen, Germany)
Newton’s method is well known as a root finder locally near the roots. It is often “not recommended” as a global root finder because of its “chaotic” properties. We give a very efficient theoretical upper bound on its speed of convergence: all roots…
Convergence of thresholding schemes for geometric flows – Tim Laux ( Max Planck Institute for Mathematics in the Sciences, Leipzig)
The thresholding scheme, a time discretization for mean-curvature flow was introduced by Meriman, Bence and Osher in 1992. In the talk we present new convergence results for modern variants of this scheme, in particular in the multi-phase case with…
Classifications of germs of diffeomorphisms and fractal properties of their orbits – Maja Resman (University of Zagreb)
We are motivated by the question of recognizing a germ of a diffeomorphism by looking at only one (discrete) orbit. The method we propose uses fractal properties of the orbit: its box dimension, or, more generally, the area of its…
Earnshaw’s Theorem in Electrostatics – Jeffrey Rauch (University of Michigan)
Earnshaw’s Theorem. (Trans. Cambridge Phil. Soc(1842)). A test charge in an electrostatic field can never be in a position of stable equilibrium. This theorem is still not proved but much progress has been made. Some seemingly more difficult results…
Location of the complex eigenvalues of dissipative problems – Vesselin Petkov (University of Bordeaux)
Venue Sala Riunioni (Dip. Matematica). Abstract…
Optimization & Numerical Analysis seminars”- Numerical methods for computing the steady-state distribution of a G-network. – Tommaso Nesti (University of Pisa) (Il Seminario si svolgerà nella Sala Seminari Est, Dipartimento Informatica.)
G-networks are a class of queueing networks introduced by E. Gelembe in 1989, which are characterized by the presence of positive and negative customers. Unlike classical queueing networks, the equations yielding the steady-state distribution of a…
Linear Response and periodic orbits – Mark Pollicott (University of Warwick)
Venue Sala Conferenze (Puteano, Centro De Giorgi). Abstract…
Global solvability of the Kirchhoff equation with Gevrey data – Tokio Matsuyama (Chuo University, Tokyo)
This talk is based on a joint work with Michael Ruzhansky and it is devoted to proving the global solvability of the Cauchy problem for the Kirchhoff equation in the Gevrey space. More precise results are derived for solutions in the s-Gevrey…