- NumPI - Mailing list — Dipartimento di Matematica, UniPI

[Indico] Nikita Deniskin, A TAME method for the Inverse Laplace Transform of tame functions - 31 Mar 2026
by Fabio Durastante 18 Mar '26

18 Mar '26

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Fw: Talk by Francesco Rinaldi - March 27th
by Fabio Durastante 04 Mar '26

04 Mar '26

Dear Everybody, Please find attached the announcement for an upcoming FLOPtalks from our friends in Florence. The seminar may be of interest to many of you. Best, Fabio ________________________________ Da: FLOPtalks <floptalks-group(a)unifi.it> Inviato: martedì, marzo 3, 2026 4:45:36 PM A: FLOPtalks <floptalks-group(a)unifi.it> Oggetto: Talk by Francesco Rinaldi - March 27th Dear colleagues and friends, we are pleased to announce next seminar of the FLorence OPtimization talkS (FLOPS) series. Francesco Rinaldi<https://www.math.unipd.it/dipartimento/persone/francesco.rinaldi/>, Full Professor at Università di Padova, will give a talk entitled "Projection-Free Optimization in Action: Scalable Methods for Network Science and Graph Learning". The talk will be on March 27th at 11:00 a.m. in Room 107 Centro didattico Morgagni<https://g.co/kgs/uuxpeDA>. The abstract of the talk is available at the following link<https://sites.google.com/unifi.it/floptalks/home?authuser=3> (as well as in the attached poster). Best regards, Marianna & Margherita -- You received this message because you are subscribed to the Google Groups "FLOPtalks" group. To unsubscribe from this group and stop receiving emails from it, send an email to floptalks-group+unsubscribe(a)unifi.it<mailto:floptalks-group+unsubscribe@unifi.it>. To view this discussion, visit https://groups.google.com/a/unifi.it/d/msgid/floptalks-group/7e4a6617-a53a-…<https://groups.google.com/a/unifi.it/d/msgid/floptalks-group/7e4a6617-a53a-…>.

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Analysis Seminar Announcement - "Non-matching coupling in fluid–structure interaction: constraints, singular forcing, and dimensional reduction" - Luca Heltai
by Fabio Durastante 16 Feb '26

16 Feb '26

Dear Everybody, Please find attached the announcement for an upcoming seminar by Luca Heltai on topics at the intersection of Analysis and Numerical Analysis. This seminar is part of the Analysis seminar series and may be of interest to many of you. Web announcement: https://www.dm.unipi.it/seminario/?id=698b2491dd82ea23a81f8461 Best regards, Fabio * Analysis Seminar: *Non-matching coupling in fluid–structure interaction: constraints, singular forcing, and dimensional reduction *Speaker: *Luca Heltai *Location: *18/02/2026 - 10.00-11.00, Aula Magna (Department of Mathematics) *Abstract.* Fluid–structure interaction problems often involve coupling conditions imposed on interfaces whose geometry is complex, thin, or evolving in time. In many relevant regimes, enforcing such conditions on matching discretizations is either impractical or conceptually inadequate, motivating the use of non-matching and immersed formulations. In this talk, we present an analytical overview of non-matching coupling methods for fluid–structure interaction, interpreting interface conditions as functional constraints, imposed on sets of varying dimensions. We focus on Lagrange multiplier formulations (classical, distributed, and reduced) and discuss their well-posedness and stability properties at both the continuous and discrete levels. A central theme of the talk is the analysis of singular forcing terms generated by non-matching constraints. On the one hand, variational formulations of non-matching coupling typically induce a loss of global regularity in the solution. We show that this loss is in fact a purely local phenomenon, and we characterize it using weighted Sobolev spaces, thereby recovering optimal approximation properties away from the interface. On the other hand, non-matching fluid–structure interaction formulations can be reinterpreted as Navier–Stokes-type problems with singular forcing terms. While classical Immersed Boundary Methods employ regularized Dirac distributions primarily for implementation purposes, we provide a general framework showing that regularization and analysis are not separate issues. In particular, we establish a rigorous connection between regularized and variational formulations, proving that suitably chosen regularizations lead to equivalent finite element approximations, with comparable accuracy and computational cost. We then address dimensional reduction strategies for slender or thin structures, showing how mixed-dimensional models naturally arise as asymptotic limits of non-matching coupling formulations. We discuss how reduced Lagrange multiplier spaces can be designed to preserve well-posedness and stability uniformly with respect to vanishing geometric scales. The presented results provide a unified functional-analytic perspective on a class of non-matching methods used in fluid–structure interaction and related problems, highlighting the mechanisms underlying their stability, accuracy, and robustness across dimensions.

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seminario Beneventano domani
by Beatrice Meini 12 Jan '26

12 Jan '26

Buonasera, scusate lo scarso preavviso. Domani alle 14, in Saletta Riunioni al Dip Matematica, Pierfrancesco Beneventano, un nostro ex studente e ora post-doc a MIT, terra' il seminario: Edge of Stochastic Stability: SGD does not train neural networks as you expect it https://www.dm.unipi.it/en/seminar/?id=694aba9c2ac7f6b23978e5a0 Saluti, Beatrice

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Fw: Talk by Davide Palitta - January 19th
by Fabio Durastante 05 Jan '26

05 Jan '26

Dear all, I am forwarding the announcement below from the FLorence OPtimization talkS (FLOPS) mailing list, as the topic may be of interest to many of you. Please find the details of the seminar hereunder. Best, Fabio ________________________________ Da: FLOPtalks <floptalks-group(a)unifi.it> Inviato: lunedì, gennaio 5, 2026 4:02:44 PM A: FLOPtalks <floptalks-group(a)unifi.it> Cc: davide.palitta(a)unibo.it <davide.palitta(a)unibo.it> Oggetto: Talk by Davide Palitta - January 19th Dear colleagues and friends, we are pleased to announce the next seminar of the FLorence OPtimization talkS (FLOPS) series. Davide Palitta<https://www.unibo.it/sitoweb/davide.palitta>, RTDb at Università di Bologna, will give a talk entitled "The S^T-S-SVD and Applications". The talk will be on January 19th at 11:00 a.m. in Room 119 Centro didattico Morgagni<https://g.co/kgs/uuxpeDA>. The abstract of the talk is available at the following link<https://sites.google.com/unifi.it/floptalks/home?authuser=3> (as well as in the attached poster). Best regards, Margherita & Marianna -- You received this message because you are subscribed to the Google Groups "FLOPtalks" group. To unsubscribe from this group and stop receiving emails from it, send an email to floptalks-group+unsubscribe(a)unifi.it<mailto:floptalks-group+unsubscribe@unifi.it>. To view this discussion, visit https://groups.google.com/a/unifi.it/d/msgid/floptalks-group/9e7571c1-e9ab-…<https://groups.google.com/a/unifi.it/d/msgid/floptalks-group/9e7571c1-e9ab-…>.

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Fwd: Talk by Simone Rebegoldi - December 11th (FLOPS)
by Fabio Durastante 04 Dec '25

04 Dec '25

Dear all, I am forwarding the announcement below from the FLorence OPtimization talkS (FLOPS) mailing list, as the topic may be of interest to many of you. Please find the details of the seminar hereunder. Best, Fabio -------- Messaggio Inoltrato -------- Oggetto: Talk by Simone Rebegoldi - December 11th Data: Thu, 4 Dec 2025 07:33:55 -0800 (PST) Mittente: FLOPtalks <floptalks-group(a)unifi.it> A: FLOPtalks <floptalks-group(a)unifi.it> CC: srebegoldi(a)unimore.it Dear colleagues and friends, we are pleased to announce the next seminar of the FLorence OPtimization talkS (FLOPS) series. Simone Rebegoldi <https://unimore.unifind.cineca.it/resource/person/113208>, RTDb at Università degli studi di Modena e Reggio Emilia,will give a talk entitled "On the convergence and stability of multiscale decompositions for imaging inverse problems". The talk will be on *December** 11th at 11:15 a.m. *in**Room 007 Centro didattico Morgagni <https://g.co/kgs/uuxpeDA>. The abstract of the talk is available at the following link <https://sites.google.com/unifi.it/floptalks/home?authuser=3> (as well as in the attached poster). Best regards, Margherita & Marianna -- You received this message because you are subscribed to the Google Groups "FLOPtalks" group. To unsubscribe from this group and stop receiving emails from it, send an email to floptalks-group+unsubscribe(a)unifi.it. To view this discussion, visit https://groups.google.com/a/unifi.it/d/msgid/floptalks-group/d52c826d-332d-… <https://groups.google.com/a/unifi.it/d/msgid/floptalks-group/d52c826d-332d-…>.

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HPSC Colloquia - Darya Majidi - L’Intelligenza Artificiale per costruire un futuro digitale, etico, ed inclusivo
by Fabio Durastante 13 Nov '25

13 Nov '25

Inizia il ciclo di incontri “HPSC Colloquia”, organizzato dal dottorato in "High Performance Scientific Computing”, in collaborazione con il ciclo di incontri "Matematici al Lavoro", in cui I nostri studenti hanno l'opportunità di confrontarsi con professionisti e scoprire le diverse carriere verso cui i percorsi formativi del nostro ateneo possono portare. Scrivo per ricordarvi del prossimo appuntamento, che sarà Mercoledì 19 Novembre alle ore 11:00 nell'Aula Magna del Dipartimento di Matematica, e online al link: https://meetings.dm.unipi.it/b/luc-bw9-xim-ayo Ospite dell'incontro sarà Darya Majidi, President UN Women Italy - Fortune Italia Most Powerful Women 2023 - CEO Daxo Group - Founder Donne 4.0 - Italian/Iranian Entrepreneur with 30 years in digital transformation & AI - Board Member - Speaker - Author. Darya terrà una conferenza dal titolo: "L’Intelligenza Artificiale per costruire un futuro digitale, etico, ed inclusivo" (di cui l'abstract è riportato sotto) L'incontro si concluderà con un dibattito e una sessione di domande e risposte, un momento prezioso per interagire direttamente con l'ospite. Tutti gli interessati sono caldamente invitati a partecipare. Non esitate a rispondere a questa email per ulteriori informazioni. Cordiali Saluti per HPSC: Luca Heltai, Giuseppe Felici per Matematici al lavoro: Stefano Galatolo, Silvia Gazzola, Marco Romito Titolo: "L’Intelligenza Artificiale per costruire un futuro digitale, etico, ed inclusivo” ABSTRACT L’intelligenza artificiale rappresenta una delle più potenti trasformazioni della nostra epoca, capace di ridefinire non solo i modelli economici e scientifici, ma anche i valori fondamentali che orientano le società umane. L’intervento propone una riflessione sulla costruzione di un’intelligenza artificiale al servizio dell’uomo, etica, trasparente e inclusiva. Verranno affrontati i temi di machine learning, reti neurali, etica, bias nei dati e e dell’importanza di un approccio multidisciplinare che integri competenze tecniche, etiche e sociali. L’obiettivo è stimolare nei ricercatori una consapevolezza critica e un impegno attivo nella progettazione di tecnologie che promuovano equità, sostenibilità e rispetto dei diritti umani.

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[Indico] Kai Bergermann, Numerical linear algebra meets multiplex networks, 13/11/2025, 11:00 Europe/Rome
by fabio.durastante＠unipi.it 12 Nov '25

12 Nov '25

Title: Numerical linear algebra meets multiplex networks, Speaker(s): Kai Bergermann, Scuola Normale Superiore, Date and time: 13 Nov 2025, 11:00 (Europe/Rome), Lecture series: Seminar on Numerical Analysis, Venue: Department of Mathematics (Sala Riunioni). You can access the full event here: https://events.dm.unipi.it/e/329 Abstract -------- Multiplex networks are used to model complex systems from myriad applications. They generalize classical complex networks by recording different types of relationships, different interactions, or changing interactions over time between the same entities in different layers. They possess natural linear algebraic representations in terms of structured matrices, which makes efficient numerical linear algebra techniques a valuable tool for their analysis. In this talk, I will present contributions to multiplex network analysis relying on matrix function approximation and nonlinear spectral methods. I will discuss centrality measures, the solution of stiff systems of non-linear differential equations with exponential Runge--Kutta integrators, un- and semi-supervised community detection, and core-periphery detection. All presented methods have a linear runtime scaling, which allows the treatment of large-scale multiplex networks and numerical experiments for all considered problems will be presented. -- Indico :: Email Notifier https://events.dm.unipi.it/e/329

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[Indico] Prof. Luca Heltai, An overview of non-matching coupling algorithm for High Performance Finite Element Applications, 11/11/2025, 14:00 Europe/Rome
by fabio.durastante＠unipi.it 10 Nov '25

10 Nov '25

Title: An overview of non-matching coupling algorithm for High Performance Finite Element Applications, Speaker(s): Prof. Luca Heltai, Università di Pisa, Date and time: 11 Nov 2025, 14:00 (Europe/Rome), Lecture series: Seminar on Numerical Analysis, Venue: Dipartimento di Matematica (Aula Seminari). Address: Largo Bruno Pontecorvo, 5, 56127 Pisa PI You can access the full event here: https://events.dm.unipi.it/e/333 Abstract -------- This seminar presents an overview of non-matching coupling algorithms for high-performance finite element applications, with emphasis on implementation and preconditioning aspects. We address ficitious domain, immersed boundary, and mixed-dimensional problems on non-matching grids, as arise in coupled PDE systems defined on heterogeneous domains. We derive different formulations and show how most of them can be traced back to variations or stabilizations of the Lagrange multiplier and distributed Lagrange multiplier frameworks. We discuss various implementation aspects of the problem, including exact and inexact integration across non-matching grids, matrix based and matrix-free transfer operators, particle-based transfer operators, and discuss briefly some augmented Lagrangian-based preconditioners, designed to yield optimal and scalable convergence properties when used in conjunction with iterative Krylov solvers. Finally, we discuss what is the current status of the implementation for these solvers within the deal.II finite element library. StreamingThe seminar will also be broadcast online at the link: https://meetings.dm.unipi.it/b/luc-kwc-keb-p9k Note ---- Reminder -- Indico :: Email Notifier https://events.dm.unipi.it/e/333

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[Indico] Prof. Luca Heltai, An overview of non-matching coupling algorithm for High Performance Finite Element Applications, 11/11/25, 2:00 PM Europe/Rome
by fabio.durastante＠unipi.it 06 Nov '25

06 Nov '25

Title: An overview of non-matching coupling algorithm for High Performance Finite Element Applications, Speaker(s): Prof. Luca Heltai, Università di Pisa, Date and time: Nov 11, 2025, 2:00 PM (Europe/Rome), Lecture series: Seminar on Numerical Analysis, Venue: Dipartimento di Matematica (Aula Seminari). Address: Largo Bruno Pontecorvo, 5, 56127 Pisa PI You can access the full event here: https://events.dm.unipi.it/e/333 Abstract -------- This seminar presents an overview of non-matching coupling algorithms for high-performance finite element applications, with emphasis on implementation and preconditioning aspects. We address ficitious domain, immersed boundary, and mixed-dimensional problems on non-matching grids, as arise in coupled PDE systems defined on heterogeneous domains. We derive different formulations and show how most of them can be traced back to variations or stabilizations of the Lagrange multiplier and distributed Lagrange multiplier frameworks. We discuss various implementation aspects of the problem, including exact and inexact integration across non-matching grids, matrix based and matrix-free transfer operators, particle-based transfer operators, and discuss briefly some augmented Lagrangian-based preconditioners, designed to yield optimal and scalable convergence properties when used in conjunction with iterative Krylov solvers. Finally, we discuss what is the current status of the implementation for these solvers within the deal.II finite element library. StreamingThe seminar will also be broadcast online at the link: https://meetings.dm.unipi.it/b/luc-kwc-keb-p9k -- Indico :: Email Notifier https://events.dm.unipi.it/e/333

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