Prossimi Seminari

Lunedì 22 Gen ore 09:00
presso Aula Enriques
seminario di analisi matematica
Tug of war and nonlinear operators
Juan Manfredi, Pittsburgh University
Seminario riservato ai membri del progetto MANET
Lunedì 22 Gen ore 09:30
presso Seminario I
seminario di algebra e geometria
Real forms of Kac Moody superalgebras, I
M.-K. Chuah
Mercoledì 24 Gen ore 11:30
presso Accademia delle Scienze
seminario di analisi matematica
Poincaré inequalities for differential forms on Heisenberg groups
Pierre Pansu
Every closed differential form \omega on a Euclidean ball has a primitive whose L^q norm is bounded by the L^p norm of \omega (for suitable exponents p and q). We prove an analogous result for Rumin's exterior differential on Heisenberg balls. This is used to prove vanishing of \ell^{q,p}-cohomology of Heisenberg groups. Extension to other Carnot groups will be discussed.
Mercoledì 24 Gen ore 14:00
presso Accademia delle Scienze
seminario di analisi matematica
Celebrating two old friends: Juan Manfredi and the p-Laplacian
Giuseppe Mingione
As a young Ph.D. student, the first nonlinear operator I met was the p-Laplacean; later on, the first visitor I invited to Parma was Juan Manfredi (in 1997, if I remember correctly). And it is definitely not by chance the two things are related. This talk is the occasion to celebrate both of them, with some recent regularity results coming form nonlinear potential theory.
Mercoledì 24 Gen ore 14:30
presso Aula Seminari - Dipartimento di Scienze Statistiche, I piano
seminario di probabilità
On Wong - Zakai approximation theorems for Ito stochastic differential equations
Alberto Lanconelli, Università degli Studi di Bari
Mercoledì 24 Gen ore 17:10
presso Accademia delle Scienze
seminario di analisi matematica
Minimal surfaces in the Heisenberg group
Sebastiano Nicolussi Golo
Geometric Measure Theory in the sub-Riemannian Heisenberg group leave unanswered several fundamental questions. The main issue is the regularity of area-minimizing surfaces, because sets of finite sub-Riemannian perimeter may have fractal behaviours. I will present some recent results obtained in collaboration with Francesco Serra Cassano and Manuel Ritoré.
Giovedì 25 Gen ore 15:00
presso Seminario II
seminario di algebra e geometria
Inner and outer automorphisms in Lie theory
Meng Kiat Chuah
For an algebraic or geometric object L, its automorphisms form a group Aut(L). If in addition Aut(L) has a topology, we denote its identity component by Int(L), and define the quotient group Out(L) = Aut(L)/Int(L). The members of Int(L) are called inner, and the remaining are called outer. Let L be a complex semisimple Lie algebra with Dynkin diagram D. It is well known that Out(L) = Aut(D). We extend this result to the real forms of L, and discuss the classification of real forms up to Int(L). We also consider possible extensions of these results to contragredient Lie superalgebras.
Venerdì 26 Gen ore 10:30
presso Accademia delle Scienze
seminario di analisi matematica
The restriction of the Fourier transform to surfaces: the hyperbolic case
Ana Vargas
The problem of restriction of the Fourier transform to hypersurfaces was posed by Stein in the seventies. This operator, in its adjoint form, gives the solution of dispersive equations (Schrödinger, wave, etc) in terms of the Fourier transform of the initial data. There are many open problems about dispersive equations for which it can be a powerful tool. Also, the restriction operator can be thought as a model case for more complicated oscillatory integral operators, such as, for instance, the operators of spherical summation of the Fourier transform. We will make a review of the problem, which is still open. We will present some new results for the case of surfaces with negative curvature. This part is joint work with Detlef Müller and Stefan Buschenhenke.
Venerdì 26 Gen ore 11:30
presso Accademia delle Scienze
seminario di analisi matematica
Mathematics of visual perception: a neurogeometrical approach
Alessandro Sarti
I will review the role of sub-Riemannian geometry in neurogeometry of the visual cortex (SE(2) group) and show how it is engendering visual perception. Particularly horizontal curves and geodesics will account for a number of geometric phenomena on the visual field. A mean field equation defined on the SE(2) geometry will model neural activity and its symmetry breaking will provide visual percepts. An open problem about heterogeneous neurogeometry will be preliminarily discussed. (Joint work with Giovanna Citti)
Venerdì 26 Gen ore 14:00
presso Seminario I
seminario di analisi matematica
nell'ambito della serie
Complex Analysis Lab
Shift invariant subspaces of the quaternionic space of slice L^2 functions
Giulia Sarfatti
In this seminar I will introduce the space of slice L^2 functions over the quaternions and I will present a characterization result for (simply and doubly) invariant subspaces for the shift operator, recently obtained in collaboration with Alessandro Monguzzi. Besides its own interest, our result gives a different proof for the quaternionic analog of the classical Beurling Theorem and allows us to obtain an inner-outer factorization for functions in the quaternionic Hardy space.
Sabato 27 Gen ore 12:00
presso Accademia delle Scienze
seminario di analisi matematica
Some random walks in the Heisenberg group
Juan Manfredi
We will discuss some examples of random walks and their relation to asymptotic mean value properties, and viscosity solutions to p-Laplace equations in the Heisenberg group.
Giovedì 01 Feb ore 16:00
presso Aula Enriques
seminario di analisi matematica
Il problema della regolarità delle geodetiche per le distanze di controllo.
Roberto Monti
Illustreremo una serie di risultati in collaborazione con vari coautori sul problema della regolarità delle curve minime per la lunghezza negli spazi di Carnot-Caratheodory. Discuteremo l'esistenza di tangenti in ogni punti a valcuni risultati algebrici sulle cosiddette curve abnormali.
Venerdì 02 Feb ore 09:00
presso Seminario II
seminario di algebra e geometria
Real forms of Kac Moody superalgebras, II
Meng Kiat Chuah
Giovedì 15 Feb ore 16:00
presso Seminario II
seminario di analisi matematica
To be communicated
Marco Bramanti
Sabato 17 Feb ore 14:00
presso - Aula Da Stabilire -
nell'ambito della serie
Complex Analysis Lab
Some results on an isoperimetric model for charged liquid drops
Berardo Ruffini
We consider an isoperimetric model, originally proposed by Lord Rayleigh, aimed to describe the (lack of) equilibria of a liquid conducting drop in presence of a charge on its surface. The resulting functional contains an attracting term, usually modeled by the perimeter of the drop, and a repulsive term depending on the amount of charge considered and the electric capacity of the drop. We show that, quite surprisingly, the resulting variational problem is ill posed. We then consider several modification of it and we investigate existence, uniqueness and stability issues about those problem. The talk is based on works in collaborations with M. Goldman, C. Muratov and M. Novaga.
Martedì 20 Feb ore 11:00
presso Aula Seminario VIII piano
seminario interdisciplinare
nell'ambito della serie
Topics in Mathematics 2017/2018
TBA
Andrea Asperti (Dipartimento di Informatica - Scienza e Ingegneria, Università di Bologna)
Mercoledì 28 Feb ore 16:00
presso Aula Tonelli
seminario di probabilità
Probabilità e Informazione
Davide Dardari, Dipartimento di Ingegneria dell'Energia Elettrica e dell'Informazione "Guglielmo Marconi"
Giovedì 15 Mar ore 14:00
presso Seminario II
seminario di analisi matematica
nell'ambito della serie
Topics in Mathematics 2017/2018
Sums of closed operators and L^p-maximal regularity for abstract parabolic equations
Alberto Venni
Giovedì 22 Mar ore 14:00
presso Seminario II
seminario di analisi matematica
nell'ambito della serie
Topics in Mathematics 2017/2018
Sums of closed operators and L^p-maximal regularity for abstract parabolic equations
Alberto Venni
Giovedì 05 Apr ore 14:00
presso Seminario II
seminario di algebra e geometria
nell'ambito della serie
Topics in Mathematics 2017/2018
TBA
Fabrizio Caselli
Martedì 10 Apr ore 14:00
presso Seminario II
seminario di algebra e geometria
nell'ambito della serie
Topics in Mathematics 2017/2018
Un'introduzione all'uso della topologia persistente per l'analisi e il confronto dei dati
Patrizio Frosini
Giovedì 12 Apr ore 14:00
presso Seminario II
seminario di algebra e geometria
nell'ambito della serie
Topics in Mathematics 2017/2018
TBA
Fabrizio Caselli
Martedì 17 Apr ore 11:00
presso Seminario II
seminario di algebra e geometria
nell'ambito della serie
Topics in Mathematics 2017/2018
Un'introduzione all'uso della topologia persistente per l'analisi e il confronto dei dati
Patrizio Frosini
Giovedì 03 Mag ore 14:00
presso Seminario II
seminario di algebra e geometria
nell'ambito della serie
Topics in Mathematics 2017/2018
TBA
Marilena Barnabei
Giovedì 10 Mag ore 14:00
presso Seminario II
seminario di algebra e geometria
nell'ambito della serie
Topics in Mathematics 2017/2018
TBA
Michele Mulazzani
Giovedì 17 Mag ore 14:00
presso Seminario II
seminario di fisica matematica
nell'ambito della serie
Topics in Mathematics 2017/2018
A baby version of a crash course on some fundamentals of infinite ergodic theory
Marco Lenci
Martedì 22 Mag ore 14:00
presso Seminario II
seminario di fisica matematica
nell'ambito della serie
Topics in Mathematics 2017/2018
A baby version of a crash course on some fundamentals of infinite ergodic theory
Marco Lenci