Prossimi seminari del Dipartimento di Matematica

Hölder regularity for a class of doubly non Linear PDEs

Filippo Cassanello

ore 17:00

presso Seminario II

seminario on line • collegamento al meeting

https://web.unica.it/unica/page/it/filippom_cassanello

analisi matematica

We prove locali Holder continuity for non negative, locally bounded, local weak solutions for a class of doubly nonlinear parabolic equations. The novelty of the proof of such result Is given by the use of an expansion of positività argoment, combined with the study of an alternative (related tò DeGiorgi-type lemmas) and an exponential shift which allows us tò deal with the intrinsic geometry associated tò the problem. Seminario organizzato per il ciclo di seminari ASK

Some results on Anisotropic PDEs - Part II

Mercoledì

Eurica Henriques

ore 16:00

presso Seminario II

PDF attached

analisi matematica

description seminar

In this talk we discuss qualitative properties of weak solutions to a class of non-linear anisotropic parabolic partial differential equations. These equations arise in models where diffusion may behave differently in each spatial direction, leading to operators with direction-dependent growth and nonstandard structure. These results illustrate how classical tools from the De Giorgi–Nash–Moser theory can be adapted to anisotropic frameworks, providing a general approach to the study of nonlinear parabolic problems with direction-dependent diffusion.

Davide Giovagnoli, Università di Bologna

On the Hölder differentiability of fractional p-harmonic functions

nell'ambito della serie: SEMINARI DI ANALISI MATEMATICA BRUNO PINI

ore 12:00

presso Aula Arzelà

seminario on line •

analisi matematica

ore 16:30

presso - Aula Da Stabilire -

analisi matematica

TBA

Francesco Leonetti (Univ. L'Aquila)

TBA

nell'ambito della serie: SEMINARI DI ANALISI MATEMATICA BRUNO PINI

ore 16:15

presso Seminario II

analisi matematica

TBA

Piergiorgio Odifreddi (Università di Torino)

Mercoledì

Come Gödel divenne Gödel

nel ciclo di seminari: MATEMATICI NELLA STORIA

ore 16:30

presso - Aula Da Stabilire -

seminario on line • collegamento al meeting

Sito del ciclo "Matematici nella storia"

logica

storia della matematica

Kurt Gödel è sicuramente uno dei più grandi logici matematici del Novecento. I suoi Teoremi di incompletezza hanno in parte frustrato le aspettative riposte dai matematici nei sistemi logico-deduttivi e hanno rivoluzionato lo sviluppo della matematica dell’ultimo secolo, influenzando in modo significativo il progresso del sapere.

Nonlinear Diffusion Equations -An Overview

Matias Vestberg

nell'ambito della serie: SEMINARI DI ANALISI MATEMATICA BRUNO PINI

ore 16:00

presso Seminario II

seminario on line • collegamento al meeting

analisi matematica

I present an overview of the topic of nonlinear diffusion equations in divergence form, with a special focus on equations exhibiting double nonlinearity. We acquaint ourselves with various equations, their applications and the mathematically relevant questions such as the existence, uniqueness and regularity of solutions. I also present some recent results concerning strongly anisotropic diffusion equations where tools from regularity theory also play a central role in the proof of the existence of solutions to a suitably formulated Cauchy-Dirichlet problem.

Approximate representations and their stability

Francesco Fournier-Facio

nell'ambito della serie: SEMINARIO DI ALGEBRA E GEOMETRIA

ore 11:00

presso Aula Seminario VIII piano

algebra e geometria

Reinforcement learning for exploratory optimal stopping: A singular control formulation

Jodi Dianetti

nell'ambito della serie: STOCHASTICS AND APPLICATIONS

ore 11:00

presso Aula Arzelà

seminario on line • collegamento al meeting (codice: ID riunione: 363 719 926 275 962 Passcode: yP9hT6CJ)

probabilità

In this talk we discuss continuous-time and state-space optimal stopping problems from a reinforcement learning perspective. We begin by formulating the stopping problem using randomized stopping times, where the decision maker's control is represented by the probability of stopping within a given time--specifically, a bounded, non-decreasing, càdlàg control process. To encourage exploration and facilitate learning, we introduce a regularized version of the problem by penalizing it with the cumulative residual entropy of the randomized stopping time. The regularized problem takes the form of an (n+1)-dimensional degenerate singular stochastic control with finite-fuel. We address this through the dynamic programming principle, which enables us to identify the unique optimal exploratory strategy. For the specific case of a real option problem, we derive a semi-explicit solution to the regularized problem, allowing us to assess the impact of entropy regularization and analyze the vanishing entropy limit. Finally, we propose a reinforcement learning algorithm based on policy iteration. We show policy improvement results for our proposed algorithm. This talk is based on a joint project together with Giorgio Ferrari and Renyuan Xu.

nell'ambito della serie: SEMINARI DI ANALISI MATEMATICA BRUNO PINI

ore 16:15

presso Aula Enriques

seminario on line • collegamento al meeting

analisi matematica

A combinatorial approach to cluster algebras

Salvatore Stella

nell'ambito della serie: SEMINARIO DI ALGEBRA E GEOMETRIA

ore 11:00

presso Aula Seminario VIII piano

algebra e geometria

Giugno

dal giorno
04/06/2026
al giorno
05/06/2026

Conference

NonPUB26 - Nonlocal and Nonlinear PDEs at the University of Bologna 4th edition

da giovedì 04 giugno 2026 a venerdì 05 giugno 2026

Conference NonPUB2 aims to give visibility to early-career researchers in the field of partial differential equations and the calculus of variations, as well as to fostering the network within both the Italian and the international communities. This project is a natural continuation of the previous editions, this year specifically seeking to deepen the themes of analysis on sub-Riemannian manifolds and the study of regularity of solutions to nonlinear equations.

Giugno

Domenica

Ivan Selesnick

Frequency-domain and sparsity in signal/image analysis

ore 08:00

presso Complesso Belmeloro

https://site.unibo.it/mml-imaging26/en/teaching-units/teaching-unit-2

analisi numerica

The course sessions will introduce linear time-invariant (LTI) systems and the related concepts and techniques of convolution, the z-transform, transfer functions, pole-zero diagrams, difference equations, frequency responses, the discrete-time Fourier transform, and frequency spectra. The discrete Fourier transform and Fast Fourier transform will be described and utilized. We will discuss the design and use of digital filters including notch filters for the elimination of tonal noise from signals, with examples and exercises in Matlab. The short-time Fourier transform (STFT) will be introduced. To extend these methods (e.g., to signals with missing data or non-uniformly sampled data), we will explain the use of least-squares (in a deterministic setting) to a variety of signal processing problems through their formulation as inverse problems. Standard LTI filters will be viewed and implemented in matrix form, and matrix-free solvers will be noted. The optimization-based inverse problem formulation framework will be extended from least-squares to nonlinear filters based on sparse signal models. The concept of sparse signal models will be introduced, along with transform-domain sparsity. The STFT, discrete wavelet transform, and total variation will be introduced as examples of transform-domain sparsity. For solving the corresponding optimization problems, the majorization-minimization (MM) framework will be illustrated, leading to iterative reweighted least squares and iterative soft-thresholding algorithms.

Giugno

Evolution problem for the 1-Laplacian with mixed boundary conditions

José M. Mazón Ruiz

nell'ambito della serie: SEMINARI DI ANALISI MATEMATICA BRUNO PINI

ore 16:00

presso Aula Cremona

seminario on line • collegamento al meeting

analisi matematica

This lecture deals with evolution problem for the 1-Laplacian with mixed boundary conditions on bounded open sets. We prove existence and uniqueness of strong solutions for square-integrable data means of the theory of maximal monotone operator. We also see that if the flux on the boundary is 1 (that is, the maximum possible) then these strong solutions can be seen as the large solutions introduced in [Journal Functional Analysis 262 (2012), 1566–1602 ]. We give explicit examples of solutions. Joint work with N. Igbida and J. Toledo

Giugno

dal giorno
15/06/2026
al giorno
19/06/2026

Conference

Advanced Courses in Operator Theory and Complex Analysis-ACOTCA2026

da lunedì 15 giugno 2026 a venerdì 19 giugno 2026

Since 2004, the ACOTCAs offer a number of mini-courses and seminars at the interface between complex analysis and operator theory. See https://sites.google.com/view/acotca-2026/home?authuser=0 and, for previous editions, https://sites.google.com/view/acotca-2026/previous-editions?authuser=0

Giugno