Questo sito utilizza solo cookie tecnici per il corretto funzionamento delle pagine web e per il miglioramento dei servizi.
Se vuoi saperne di più o negare il consenso consulta l'informativa sulla privacy.
Proseguendo la navigazione del sito acconsenti all'uso dei cookie.
Se vuoi saperne di più o negare il consenso consulta l'informativa sulla privacy.
Proseguendo la navigazione del sito acconsenti all'uso dei cookie.
Prossimi seminari del Dipartimento di Matematica
tra circa un'ora
Giovedì
06 febbraio
David Jesus, Università di Bologna
nell'ambito della serie: SEMINARI DI ANALISI MATEMATICA BRUNO PINI
Seminario di analisi matematica
ore
15:00
presso Seminario II
seminario on line •
collegamento al meeting
Transmission problems describe physical phenomena where the behavior of a system changes across a fixed interface, resulting in different PDEs on each side. These PDEs are coupled through a transmission condition, typically of the Neumann type.
In this talk, we will discuss some recent results concerning transmission problems governed by fully nonlinear operators which degenerate near the transmission interface. We obtain Holder differentiability of solutions up to the interface, with optimal exponent, which depends pointwise on the rate of degeneracy.
Research activity supported by PRIN 2022 7HX33Z - CUP J53D23003610006, Pattern formation in nonlinear phenomena
tra circa 2 ore
Giovedì
06 febbraio
Alessandro Verra
nel ciclo di seminari: MATEMATICI NELLA STORIA
Seminario di algebra e geometria, storia della matematica
ore
16:00
presso Aula Cremona
seminario on line •
collegamento al meeting
La conferenza intende approfondire la figura, storica e scientica, del grande geometra Jakob Steiner alla luce del suo viaggio in Italia, svoltosi nel 1843-44. Uno degli episodi salienti del viaggio è la scoperta della superficie che prese poi il nome di superficie romana di Steiner. Esso si inserisce in un più ampio episodio, con tutte le caratteristiche di un Grand Tour, che
vedrrà, in Italia con Steiner, altri matematici di primissimo piano, residenti a Berlino o comunque collegati all'odierna Humboldt Universitaet di tale città.
Sarà proprio Alexander von Humboldt a spendersi per rendere possibile tale impresa a Steiner ed ai suoi compagni di viaggio: Carl Borchardt, Johann P. G. Lejeune Dirichlet, Carl Gustav Jacobi e Ludwig Schlaefli. Su di essa diversi spunti di informazione e descrizione verranno presentati, al fine di metterne a fuoco i diversi aspetti storici, geometrici e culturali, negli anni che precedevano la nascita, con Luigi Cremona e diversi altri, della Scuola geometrica italiana.
Venerdì
07 febbraio
Alessandro Ingrosso
nel ciclo di seminari: SEMINARS IN MATHEMATICAL PHYSICS AND BEYOND
Seminario di fisica matematica
ore
11:00
presso Seminario I
Transfer learning (TL) is a well-established machine learning technique to boost the generalization performance on a specific (target) task using information gained from a related (source) task, and it crucially depends on the ability of a network to learn useful features. I will present a recent work that leverages analytical progress in the proportional regime of deep learning theory (i.e. the limit where the size of the training set P and the size of the hidden layers N are taken to infinity keeping their ratio P/N finite) to develop a novel statistical mechanics formalism for TL in Bayesian neural networks. I'll show how such single-instance Franz-Parisi formalism can yield an effective theory for TL in one-hidden-layer fully-connected neural networks. Unlike the (lazy-training) infinite-width limit, where TL is ineffective, in the proportional limit TL occurs due to a renormalized source-target kernel that quantifies their relatedness and determines whether TL is beneficial for generalization.
Lunedì
10 febbraio
Federico Bambozzi
nell'ambito della serie: LOGIC, CATEGORIES, AND APPLICATIONS SEMINAR
Seminario di algebra e geometria, logica, teoria delle categorie
ore
14:00
presso Seminario II
Martedì
11 febbraio
Luca Pol
nell'ambito della serie: SEMINARIO DI ALGEBRA E GEOMETRIA
Seminario di algebra e geometria
ore
11:00
presso - Aula Da Stabilire -
Martedì
18 febbraio
Alessio D'Alì
nell'ambito della serie: SEMINARIO DI ALGEBRA E GEOMETRIA
Seminario di algebra e geometria
ore
11:00
presso Aula Seminario VIII piano
Mercoledì
19 febbraio
Claudia Ceci
nell'ambito della serie: STOCHASTICS AND APPLICATIONS - 2025
Seminario di finanza matematica, probabilità
ore
11:00
presso - Aula Da Stabilire -
seminario on line •
We investigate the optimal self-protection problem, from the point of view of an insurance buyer, when the loss process is described by a Cox-shot-noise process and a Hawkes process with an exponential memory kernel. The insurance buyer chooses both the percentage of insured losses and the prevention effort. The latter term refers to actions aimed at reducing the frequency of the claim arrivals. The problem consists in maximizing the expected exponential utility of terminal wealth, in presence of a terminal reimbursement. We show that this problem can be formulated in terms of a suitable backward stochastic differential equation (BSDE), for which we prove existence and uniqueness of the solution. We extend in several directions the results obtained by Bensalem, Santibanez and Kazi-Tani [Finance Stoch. 2023] and compare our results with those presented therein.
The talk is based on a joint paper with M. Brachetta, G. Callegaro and C. Sgarra.
Mercoledì
19 febbraio
Michela Lapenna
nel ciclo di seminari: SEMINARS IN MATHEMATICAL PHYSICS AND BEYOND
Seminario di fisica matematica
ore
11:00
presso - Aula Da Stabilire -
Mercoledì
19 febbraio
Philippe Ellia
nel ciclo di seminari: MATEMATICI NELLA STORIA
Seminario di algebra e geometria, analisi numerica, storia della matematica
ore
16:00
presso Aula Pincherle
seminario on line •
Giovedì
20 febbraio
Sunra Mosconi
nell'ambito della serie: SEMINARI DI ANALISI MATEMATICA BRUNO PINI
Seminario di analisi matematica
ore
14:30
presso Seminario I
seminario on line •
collegamento al meeting
I will discuss the existence of a solution to the logarithmic Schrödinger equation in a bounded convex domain, with the property that log u is concave. Since the reaction is sign-changing and non-monotone, the classical techniques to attack the problem fail. We instead rely on a continuity argument for the approximating Lane-Emden problems based on the heuristic argument. We will discuss the optimality of the result, exhibiting for any α > 0 a solution such that u^a is not concave.
This is a joint work with M. Squassina and M. Gallo.
Giovedì
20 febbraio
Paolo Albano
nell'ambito della serie: SEMINARI DI ANALISI MATEMATICA BRUNO PINI
Seminario di analisi matematica
ore
16:00
presso Aula Arzelà
seminario on line •
collegamento al meeting
We discuss the strong unique continuation property for linear differential operators of the form sum of squares of vector fields satisfying the Hörmander condition.
We provide some negative and some positive results.
Venerdì
21 febbraio
Josh Wringley
nell'ambito della serie: LOGIC, CATEGORIES, AND APPLICATIONS SEMINAR
Seminario di algebra e geometria, logica, teoria delle categorie
ore
14:00
presso Seminario I
Martedì
04 marzo
Roberto Pignatelli
nell'ambito della serie: SEMINARIO DI ALGEBRA E GEOMETRIA
Seminario di algebra e geometria
ore
11:00
presso Aula Seminario VIII piano
In the first part of the seminar, I will discuss the concept of Birational Geometry, introduce some birational iInvariants and the moduli spaces of varieties of general type, along with a few examples that I consider significant.
In the second part, I will present some recent results, obtained in collaboration with S. Coughlan, Y. Hu, and T. Zhang, on certain moduli spaces of three-dimensional varieties of general type.
Mercoledì
19 marzo
Luciano Campi
nell'ambito della serie: STOCHASTICS AND APPLICATIONS - 2025
Seminario di finanza matematica, probabilità
ore
11:00
presso - Aula Da Stabilire -
seminario on line •
Venerdì
21 marzo
Frank Neumann
Seminario di logica, teoria delle categorie
ore
14:00
presso Seminario II
Abstract: The Hochschild cohomology of a differential graded algebra or more generally of a differential graded category admits a natural map to the graded center of its derived category: the characteristic homomorphism. We interpret this map as an edge homomorphism in a spectral sequence, which allows to study the characteristic homomorphism systematically in many interesting examples from algebra, geometry, topology and physics. To illustrate this, we will discuss several concrete examples related to coherent sheaves on algebraic curves and cochains of classifying spaces of Lie groups. If time permits, I will also indicate a new extension of this framework to $A_\infty$-categories. Some of this is joint work with M. Szymik (Sheffield) other with A. Phimister (Leicester).
Venerdì
28 marzo
Alessio Savini
nell'ambito della serie: LOGIC, CATEGORIES, AND APPLICATIONS SEMINAR
Seminario di algebra e geometria, logica
ore
14:00
presso Seminario II
Given a measured groupoid G, together with Filippo Sarti, we defined a cohomology theory which generalizes the measurable bounded cohomology of a locally compact group. In the particular case of a groupoid associated to a measure preserving action, our cohomology boils down to the usual bounded cohomology of the group with twisted coefficients. We will discuss the possible applications of this result to orbit equivalence.
Lunedì
31 marzo
Pierfrancesco Urbani
nel ciclo di seminari: CONTINUOUS CONSTRAINT SATISFACTION AND OPTIMIZATION PROBLEMS
Seminario di fisica matematica, probabilità
ore
14:00
presso Seminario II
Constraint satisfaction problems (CSP) are central in computational
complexity theory. They are defined through a large number of degrees of freedom which are
subjected to a large number of constraints. Finding solutions to all the constraints may be
simple or hard depending on the control parameters of the problem. In recent years statistical
physics techniques have been developed to study random CSP, namely CSP extracted from an
ensemble of problems. In these lectures, I will focus on a particular class of such CSP that are
defined out of Continuous (real) degrees of freedom (CCSP). These problems have become very
popular nowadays due to the fact CCSPs appear in a wide variety of fields: artificial neural
networks, glasses, and granular materials, the physics of biological tissues, packing problems in
mathematics, and field theory in high energy physics. In these lectures, I will discuss simple
paradigmatic models of non-convex CCSP in high dimension, introduce general methods to
study the landscape of solutions and their concentration properties, and consider the
algorithmic problem of finding solutions via general classes of algorithms (gradient descent and
variants, message passing).
Martedì
01 aprile
Federico Tufo
nell'ambito della serie: SEMINARIO DI ALGEBRA E GEOMETRIA
ore
11:00
presso aula Filopanti, viale Filopanti 5
Mercoledì
02 aprile
Pierfrancesco Urbani
nel ciclo di seminari: CONTINUOUS CONSTRAINT SATISFACTION AND OPTIMIZATION PROBLEMS
Seminario di fisica matematica, probabilità
ore
09:00
presso Seminario II
Constraint satisfaction problems (CSP) are central in computational
complexity theory. They are defined through a large number of degrees of freedom which are
subjected to a large number of constraints. Finding solutions to all the constraints may be
simple or hard depending on the control parameters of the problem. In recent years statistical
physics techniques have been developed to study random CSP, namely CSP extracted from an
ensemble of problems. In these lectures, I will focus on a particular class of such CSP that are
defined out of Continuous (real) degrees of freedom (CCSP). These problems have become very
popular nowadays due to the fact CCSPs appear in a wide variety of fields: artificial neural
networks, glasses, and granular materials, the physics of biological tissues, packing problems in
mathematics, and field theory in high energy physics. In these lectures, I will discuss simple
paradigmatic models of non-convex CCSP in high dimension, introduce general methods to
study the landscape of solutions and their concentration properties, and consider the
algorithmic problem of finding solutions via general classes of algorithms (gradient descent and
variants, message passing).
Venerdì
04 aprile
Pierfrancesco Urbani
nel ciclo di seminari: CONTINUOUS CONSTRAINT SATISFACTION AND OPTIMIZATION PROBLEMS
Seminario di fisica matematica, probabilità
ore
14:00
presso Seminario II
Constraint satisfaction problems (CSP) are central in computational
complexity theory. They are defined through a large number of degrees of freedom which are
subjected to a large number of constraints. Finding solutions to all the constraints may be
simple or hard depending on the control parameters of the problem. In recent years statistical
physics techniques have been developed to study random CSP, namely CSP extracted from an
ensemble of problems. In these lectures, I will focus on a particular class of such CSP that are
defined out of Continuous (real) degrees of freedom (CCSP). These problems have become very
popular nowadays due to the fact CCSPs appear in a wide variety of fields: artificial neural
networks, glasses, and granular materials, the physics of biological tissues, packing problems in
mathematics, and field theory in high energy physics. In these lectures, I will discuss simple
paradigmatic models of non-convex CCSP in high dimension, introduce general methods to
study the landscape of solutions and their concentration properties, and consider the
algorithmic problem of finding solutions via general classes of algorithms (gradient descent and
variants, message passing).
Lunedì
07 aprile
Pierfrancesco Urbani
nel ciclo di seminari: CONTINUOUS CONSTRAINT SATISFACTION AND OPTIMIZATION PROBLEMS
Seminario di fisica matematica, probabilità
ore
14:00
presso Seminario II
Constraint satisfaction problems (CSP) are central in computational
complexity theory. They are defined through a large number of degrees of freedom which are
subjected to a large number of constraints. Finding solutions to all the constraints may be
simple or hard depending on the control parameters of the problem. In recent years statistical
physics techniques have been developed to study random CSP, namely CSP extracted from an
ensemble of problems. In these lectures, I will focus on a particular class of such CSP that are
defined out of Continuous (real) degrees of freedom (CCSP). These problems have become very
popular nowadays due to the fact CCSPs appear in a wide variety of fields: artificial neural
networks, glasses, and granular materials, the physics of biological tissues, packing problems in
mathematics, and field theory in high energy physics. In these lectures, I will discuss simple
paradigmatic models of non-convex CCSP in high dimension, introduce general methods to
study the landscape of solutions and their concentration properties, and consider the
algorithmic problem of finding solutions via general classes of algorithms (gradient descent and
variants, message passing).
Martedì
08 aprile
Laura Pertusi
nell'ambito della serie: SEMINARIO DI ALGEBRA E GEOMETRIA
Seminario di algebra e geometria
ore
11:00
presso Aula Vitali
TBA
Mercoledì
09 aprile
Pierfrancesco Urbani
nel ciclo di seminari: CONTINUOUS CONSTRAINT SATISFACTION AND OPTIMIZATION PROBLEMS
Seminario di fisica matematica, probabilità
ore
09:00
presso Seminario II
Constraint satisfaction problems (CSP) are central in computational
complexity theory. They are defined through a large number of degrees of freedom which are
subjected to a large number of constraints. Finding solutions to all the constraints may be
simple or hard depending on the control parameters of the problem. In recent years statistical
physics techniques have been developed to study random CSP, namely CSP extracted from an
ensemble of problems. In these lectures, I will focus on a particular class of such CSP that are
defined out of Continuous (real) degrees of freedom (CCSP). These problems have become very
popular nowadays due to the fact CCSPs appear in a wide variety of fields: artificial neural
networks, glasses, and granular materials, the physics of biological tissues, packing problems in
mathematics, and field theory in high energy physics. In these lectures, I will discuss simple
paradigmatic models of non-convex CCSP in high dimension, introduce general methods to
study the landscape of solutions and their concentration properties, and consider the
algorithmic problem of finding solutions via general classes of algorithms (gradient descent and
variants, message passing).
Venerdì
11 aprile
Pierfrancesco Urbani
nel ciclo di seminari: CONTINUOUS CONSTRAINT SATISFACTION AND OPTIMIZATION PROBLEMS
Seminario di fisica matematica, probabilità
ore
14:00
presso Seminario II
Constraint satisfaction problems (CSP) are central in computational
complexity theory. They are defined through a large number of degrees of freedom which are
subjected to a large number of constraints. Finding solutions to all the constraints may be
simple or hard depending on the control parameters of the problem. In recent years statistical
physics techniques have been developed to study random CSP, namely CSP extracted from an
ensemble of problems. In these lectures, I will focus on a particular class of such CSP that are
defined out of Continuous (real) degrees of freedom (CCSP). These problems have become very
popular nowadays due to the fact CCSPs appear in a wide variety of fields: artificial neural
networks, glasses, and granular materials, the physics of biological tissues, packing problems in
mathematics, and field theory in high energy physics. In these lectures, I will discuss simple
paradigmatic models of non-convex CCSP in high dimension, introduce general methods to
study the landscape of solutions and their concentration properties, and consider the
algorithmic problem of finding solutions via general classes of algorithms (gradient descent and
variants, message passing).
Lunedì
21 aprile
Claudio Agostini
nell'ambito della serie: LOGIC, CATEGORIES, AND APPLICATIONS SEMINAR
Seminario di algebra e geometria, logica
ore
14:00
presso Seminario II
Given a realcompact space X, we denote by Exp(X) the smallest infinite cardinal
κ such that X is homeomorphic to a closed subspace of Rκ.
In this talk, we analyze the realcompactness number of countable spaces. We
will show that, for every cardinal κ, there exists a countable crowded space X such
that Exp(X) = κ if and only if p ≤ κ ≤ c. On the other hand, we show that a
scattered space of weight κ has pseudocharacter at most κ in any compactification.
This will allow us to calculate Exp(X) for an arbitrary (that is, not necessarily
crowded) countable space.
This is a joint work with Andrea Medini and Lyubomyr Zdomskyy.
Martedì
13 maggio
Roberto Svaldi
nell'ambito della serie: SEMINARIO DI ALGEBRA E GEOMETRIA
Seminario di algebra e geometria
ore
11:00
presso Aula Seminario VIII piano
Giovedì
22 maggio
Moritz Egert
nell'ambito della serie: SEMINARI DI ANALISI MATEMATICA BRUNO PINI
Seminario di analisi matematica
ore
16:30
TBA
16/06/2025
18/06/2025
18/06/2025
Conference
Three Days in Sub-Riemannian Geometry
da lunedì 16 giugno 2025
a mercoledì 18 giugno 2025
16/06/2025
18/06/2025
18/06/2025
Conference
Three Days in Sub-Riemmanian Geometry
da lunedì 16 giugno 2025
a mercoledì 18 giugno 2025
Mercoledì
18 giugno
Giuseppina Guatteri
nell'ambito della serie: STOCHASTICS AND APPLICATIONS - 2025
Seminario di probabilità
ore
11:00
presso - Aula Da Stabilire -
seminario on line •