Titolo On the existence of solutions to weakly coupled elliptic system with critical growth Abstract We consider a critical weakly coupled elliptic systems in a domain D in R^N with N=3,4 or in the whole space. We prove the existence of positive…
Categoria evento: Seminars
An introduction to ideal simplicial volume – Marco Moraschini (Università di Pisa)
The simplicial volume is a homotopy invariant of compact manifolds introduced in 1982 by Gromov in his pioneering paper “Volume and Bounded Cohomology”. Roughly speaking, the simplicial volume measures how difficult is to describe a manifold in…
Infinity structures and higher products in rational homotopy theory – José Manuel Moreno-Fernández (Universidad de Málaga)
The goal of this talk is to understand how L-infinity structures on the rational homotopy groups of a simply connected space behave with respect to the higher Whitehead products. To do so, I will give a self-contained introduction to the relevant…
On classical, extended, and rational Krylov and the associated QR algorithms – Raf Vandebril (KU Leuven)
In this lecture we will discuss three main classes of Krylov and QR type methods: the classical, the extended, and the rational versions. We will initially focus on the classical QR method and reintepret all ingredients such as: associated Krylov…
Il teorema di Szego – Alexander Bufetov (CNRS I2M, Marseille and Steklov Mathematical Institute, Moscow )
#ENG Gabor Szego proved the first version of this theorem when he was 20, and he proved it in a stronger version when he was 57. He established asymptotic properties of Toeplitz determinants which nowadays are of crucial importance in many fields.…
Limiting behaviour of rescaled nonlocal perimeters and of their first variations. – Valerio Pagliari (Universita’ di Pisa)
We introduce a class of integral functionals known as nonlocal perimeters, which can be thought as interactions between a set and its complement that are weighted by a positive kernel. In the first part of the talk, we summarise the main features of…
Introduzione alla norma di Thurston – Gabriele Viaggi (Hausdorff Center for Mathematics, Bonn)
La norma di Thurston è una norma definita sull’omologia di una 3-varietà M e descrive la complessità delle superfici contenute nella varietà. Al pari di ogni norma su uno spazio euclideo, anche la norma di Thurston è descritta dalla sua palla…
Classification of Thurston Maps – Anastasia Shepelevtseva (Scuola Normale Superiore)
Aula M1 Polo Fibonacci Abstract: Let f : S^2 –>S^2 be an orientation preserving branched covering of degree 2. The map f has two critical points c_1(f) and c_2(f). Let v_1(f) and v_2(f) be the corresponding critical values. The post-critical set of…
Un esempio di noce di Grothendieck: la soluzione di Artin-Schreier del 17° problema di Hilbert- Fabrizio Broglia (Dipartimento di Matematica, Università di Pisa)
Un esmpio di noce di Grothendieck: la soluzione di Artin-Schreier del 17° problema di Hilbert…
Geometry of alternating links on surfaces – Joshua Howie (Monash University)
We study links in 3-manifolds which have alternating diagrams onto orientable surfaces of positive genus. When the diagram is sufficiently complicated, we are able to obtain topological and geometrical information about the link exterior. In…