- Geometria_Pisa - Mailing list — Dipartimento di Matematica, UniPI

Seminario Baby Geometri 23/04
by Giorgia BENASSI 20 Apr '26

20 Apr '26

Carə tuttə, vi invitiamo al seminario dei Baby Geometri di questa settimana: *Giovedì 23 Aprile 2026, alle ore 11:15* Presso la Saletta Riunioni (Dipartimento di matematica) *Susanna Terron* (University of Glasgow) terrà un seminario dal titolo: *Constructing Thompson representatives* di cui riportiamo l'abstract: In 2017 Vaughan Jones introduced a construction associating links to elements of Thompson’s group F. He then proved that all links can be obtained in such a way, opening the way to new possible connections between these objects. I will present Jones’ construction and extend it to obtain a surjective map into the set of pointed links. I’ll then define a new algebraic structure by endowing the group F3 with a monoid operation, which turns our map into a surjective monoid homomorphism. As a consequence, we obtain a standard form for connected sum representatives, which can then be extended to obtain representatives for a certain family of links, that we will refer to as tree links. Vi ricordiamo infine che potrete trovare informazioni sui prossimi seminari sul nostro sito <https://sites.google.com/view/babygeometri/home>. Tutte le persone interessate sono invitate a partecipare. A presto, Lə organizzatorə

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Seminario Baby Geometri 13/04
by Giorgia BENASSI 10 Apr '26

10 Apr '26

Carə tuttə, vi invitiamo al seminario dei Baby Geometri della prossima settimana: *Lunedì 13 Aprile 2026, alle ore 11:15* Presso l’*Aula Contini* (Palazzo della Carovana) *Shaked Bader* (University of Oxford) terrà un seminario dal titolo: *Group cohomology with Banach space coefficients* di cui riportiamo l'abstract: Gromov conjectured that the L^p-cohomology of simple Lie groups vanishes below the rank. Farb conjectured a fixed point property for actions of lattices in such groups on CAT(0) cell complexes of dimension lower than the rank. In this talk I will give a short introduction to group cohomology and prove that vanishing of \ell^1-cohomology up to degree n implies a finite orbit for every action on an n-dimensional contrcatible complex, thus in particular establishing that Gromov's conjecture implies Farb's conjecture. I will then give some insight to the proof of Gromov's conjecture. This talk is based on joint work with Saar Bader, Uri Bader and Roman Sauer. Vi ricordiamo infine che potrete trovare informazioni sui prossimi seminari sul nostro sito. Tutte le persone interessate sono invitate a partecipare. A presto, Lə organizzatorə

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Fwd: Seminario MAP
by Alessio DI PRISA 08 Apr '26

08 Apr '26

Inoltro questo annuncio per conto degli organizzatori dei seminari MAP. Saluti, Alessio ---------- Forwarded message --------- Da: Chiara GAMBICCHIA <chiara.gambicchia(a)sns.it> Date: mar 7 apr 2026, 16:10 Subject: Seminario MAP To: Alessio DI PRISA <alessio.diprisa(a)sns.it> Caro Alessio, ti sarei grata se potessi inoltrare l'annuncio del prossimo seminario MAP (di cui riporto sotto le informazioni) alla mailing list dei geometri, visto che lo speaker è Cristian Sopio, che so essere stato invitato in precedenza per un seminario di geometria. Grazie mille, Chiara ---------------------------------------------------- When and where: Thursday 9 April, at 11:30 in Aula Seminari (Dipartimento di Matematica). Speaker: Cristian Sopio (Università di Parma) Title: Weak elastic energy of rectifiable curves in the sphere Abstract: In 1950, Milnor introduced a definition of total curvature for rectifiable (hence Lipschitz) curves in R^n and proved that if the curve is C^2-regular and parametrized by arc length, this definition coincides with the integral of the norm of the geodesic curvature of the curve. In 2023, Mucci and Saracco proposed a definition of p-curvature for any exponent p greater than or equal to 1, showing that a rectifiable curve parametrized by arc length belongs to the Sobolev space W^{2,p} if and only if its p-curvature is finite. Moreover, in this case, the p-curvature equals the integral on the curve of the p-th power of the norm of its geodesic curvature. In this seminar, I will explain how the concept of p-curvature can be extended to rectifiable curves in the sphere and how analogous results can be obtained in this setting. This is joint work with D. Mucci and A. Saracco.

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seminario Alejandro Gil-Garcìa
by Diego Conti 07 Apr '26

07 Apr '26

Cari colleghi, vi segnalo che giovedì 23 aprile, alle 14:30 in aula seminari, Alejandro Gil-Garcìa terrà un seminario di geometria. Trovate qui sotto titolo e abstract. Per chi fosse interessato, ci troviamo nell'atrio davanti all'aula riunioni alle 13 per andare a pranzo con lo speaker. Title: The algebraic square of an irreducible complex spinor Abstract: We characterize, in every dimension and signature, the algebraic squares of an irreducible complex spinor as a pair of exterior forms satisfying a prescribed system of algebraic relations that we present in terms of the geometric product of the underlying quadratic vector space. As a result, we obtain a general correspondence between irreducible complex spinors and algebraically constrained exterior forms, which clarifies the subtle relationship between spinors and exterior forms and contributes towards the understanding of spinors as the square root of geometry. Time permitting, we will explore the differential counterpart of this correspondence. This is joint work with Carlos Shahbazi. The talk is based on https://arxiv.org/abs/2510.13801. Saluti Diego

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Annuncio Combinatorial Algebraic Topology and Applications IV
by Carlo Collari 07 Apr '26

07 Apr '26

Buongiorno, Ricordo a tutti gli interessati che dal 22 al 25 Giugno a Pisa si svolgerà CATA IV, di cui riporto l'annuncio. Le iscrizioni si chiuderanno il 30 Aprile. Saluti, Carlo Combinatorial Algebraic Topology, and Applications IV ----------------------------------------- https://gecogedi.dimai.unifi.it/event/1448/ Date: Monday, Jun 22, 2026 -- Thursday, Jun 25, 2026 Place: Pisa, Italy The workshop “Combinatorial algebraic topology and applications” is at its fourth edition. The first, second, and third editions were held in Pisa at the Centro di Ricerca Matematica “E. De Giorgi” on the 27-28 November 2023, 1-4 October 2024, and 16-19 September 2025, respectively. The main topics of the conference are combinatorics and algebraic topology (broadly intended), as well as their applications to different fields (e.g. data analysis, neural sciences and economics). The aim of the workshop is to gather researchers with common interest in the above topics and to create an atmosphere of discussion where to share ideas. For its fourth edition, the workshop will focus specifically on the following topics: applied (algebraic) topology, low-dimensional and geometric topology, and topological combinatorics. The workshop will consist of ten one-hour talks from invited speakers, along with contributed talks by selected participants. The talks will cover both theoretical and applied aspects of the subjects. The invited speakers are at different stages of the academic career, including professors, lecturers, PhD students and post-docs. Moreover, to stimulate discussion and exchange of ideas, the workshop will include free discussions, contributed talks, and possibly a problem session. We are committed to ensure gender balance as well as broad participation across academic backgrounds and career stages. Registration is free, though mandatory, due to limitations in the number of participants. Depending on funding limited support may be available for junior participants, with priority given to early registrations and contributed speakers. The *deadline for contributed talks and support is the 31st of March 2026*. The *deadline for registration is the 30th of April 2026*. LIST OF CONFIRMED SPEAKERS Valentina Bais (SISSA) Bruno Benedetti (University of Miami) Jelena Grbic (University of Southampton) Dmitrii Korshunov (Institut de mathématiques de Jussieu –Paris Rive Gauche) Jean- Baptiste Meilhan (Université Grenoble Alpes) Pegah Pournajafi (Collège de France) Francesca Pratali (Universiteit Utrecht) Anne-Laure Thiel (Université Bourgogne Europe) Francesco Vaccarino (Politecnico di Torino) So Yamagata (Fukuoka University) Organizing Commitee: L. Caputi, C. Collari, G. Menara Invited Speakers: webpage of the workshop: https://indico.sns.it/event/134/

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Baby Geometri e uncinetto
by Giorgia BENASSI 25 Mar '26

25 Mar '26

Carə tuttə, vi invitiamo al seminario dei Baby Geometri della prossima settimana, in cui impareremo le basi dell'uncinetto per arrivare a costruire un piano iperbolico. Per avvicinarci, costruiremo prima tutte le 1-varietà compatte a meno di omeomorfismo, e una parte di piano euclideo. Invitiamo tutte le persone interessate a compilare questo form <https://docs.google.com/forms/d/e/1FAIpQLSdzYY6aAZNbTPKEsV0SP3kF62bUeXOW-Uo…>, per decidere la data e capire quanti gomitoli saranno necessari. Vi ricordiamo infine che potrete trovare informazioni sui prossimi seminari sul nostro sito <https://sites.google.com/view/babygeometri>. A presto, Lə organizzatorə

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Seminario Baby Geometri 19/03
by Giorgia BENASSI 13 Mar '26

13 Mar '26

Carə tuttə, vi invitiamo al seminario dei Baby Geometri della prossima settimana: Giovedì 19 Marzo 2026, alle ore 11:15 Presso l’Aula Bianchi Scienze (Palazzo della Carovana) Simone Tagliente (Rényi Institute of Mathematics and Eötvös Loránd University, Budapest) terrà un seminario dal titolo: Exotic 4-manifolds with infinite dihedral fundamental group di cui riportiamo l'abstract: We construct infinite families of exotic 4-manifolds with infinite dihedral fundamental group. This group is the non-trivial semi-direct product of Z and Z_2, or equivalently the free product of Z_2 and Z_2. The key idea of the construction is to assemble simply-connected building blocks to construct the universal cover, and then to perform surgeries in an equivariant way. The diffeomorphism types of these exotic manifolds are distinguished by the Seiberg-Witten invariants of their double covers, while to show that their homeomorphism type is the same we use a recent result of Hillman-Kasprowski-Powell-Ray. Vi ricordiamo infine che potrete trovare informazioni sui prossimi seminari sul nostro sito <https://sites.google.com/view/babygeometri>. Tutte le persone interessate sono invitate a partecipare. A presto, Lə organizzatorə

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Fibrations in Group Theory and Topology - Oxford
by Giovanni Italiano 12 Mar '26

12 Mar '26

Dear all, This is the first announcement of the conference "*Fibrations in Group Theory and Topology*" that will be held at the University of Oxford, in 7-11 September 2026. There is (limited) accommodation funding for early career researchers, please apply as early as possible if you are interested in it, and before 10 April 2026. Registration is open! All the information can be found on the website https://sites.google.com/view/oxfordfibring2026. Please feel free to contact me with any questions. This is the list of speakers: *Mini-Course Speakers* Wolfgang Lück (Universität Bonn) Bruno Martelli (Università di Pisa) *Speakers* Macarena Arenas (University of Cambridge) Grigori Avramidi (MPIM Bonn) Sam Fisher (ICMAT Madrid) Kasia Jankiewicz (University of California Santa Cruz) Monika Kudlinska (University of Cambridge) Claudio Llosa Isenrich (Karlsruher Institut für Technologie) Matteo Migliorini (Karlsruher Institut für Technologie) Boris Okun (University of Wisconsin–Milwaukee) Kevin Schreve (Louisiana State University) Matthew Stover (Temple University) Best wishes, Giovanni Italiano

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Fw: Postdoctoral position in Nantes
by Paolo Lisca 02 Mar '26

02 Mar '26

Condivido annuncio di posizione post-doc. Paolo Lisca ________________________________ From: Fabio Gironella <fabio.gironella(a)cnrs.fr> Sent: Monday, March 2, 2026 02:27 Cc: Fabio Gironella <fabio.gironella(a)univ-nantes.fr> Subject: Postdoctoral position in Nantes Dear friends and colleagues, I am writing to advertise a 1-year postdoc position at the Laboratoire de Mathématiques Jean Leray at Nantes Université. The position is in the context of the ANR project SiSyFo. The ideal candidate will have expertise in the area of symplectic geometry, understood in a broad sense. A detailed knowledge of pseudo-holomorphic curves and/or Floer theory is a plus. Familiarity with foliation theory and/or Poisson geometry is also welcome, but not necessary. The research team to which the postdoc will belong counts several experts with interests in / related to symplectic geometry: Erwan Brugallé, Baptiste Chantraine, Vincent Colin, Marco Golla, Stephane Guillermou, François Laudenbach, Rémi Leclercq, and myself. The position also comes with funding for research related travel and activities. The suggested starting date is 1rst September 2026. A later start of the contract, by the end of 2026 at most, can also be agreed upon. The application procedure is at this page: https://emploi.cnrs.fr/Offres/CDD/UMR6629-FABGIR-002/Default.aspx?lang=EN<https://emploi.cnrs.fr/Offres/CDD/UMR6629-FABGIR-002/Default.aspx> . (Also accessible from my homepage https://fabiogironella.com/ ) The application deadline is (for the moment) set for 22/03/2026 at 23:59 CET. For any questions (including about the application procedure), you can reach out to me at fabio.gironella(a)cnrs.fr<mailto:fabio.gironella@cnrs.fr> . Please feel free to forward this announcement to any potential candidate. Best regards, Fabio Gironella

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Annuncio CATA IV
by Carlo Collari 09 Feb '26

09 Feb '26

Buongiorno, Allego, per gli interessati, l'annuncio della quarta edizione di CATA, che si svolgerà a Pisa, presso il centro De Giorgi dal 22 al 25 Giugno 2026. A presto, Carlo _____________________________________________ Dear All, This is to announce the workshop *Combinatorial Algebraic Topology, and Applications IV <https://indico.sns.it/event/134/> *(CATA IV), that will be held at Centro De Giorgi in Pisa (IT) from June 22nd to 25th, 2026. The list of speakers includes: Valentina Bais (SISSA) Bruno Benedetti (University of Miami) Jelena Grbic (University of Southampton) Dmitrii Korshunov (Institut de mathématiques de Jussieu - Paris Rive Gauche) Jean-Baptiste Meilhan (Université Grenoble Alpes) Pegah Pournajafi (Collège de France) Francesca Pratali (Universiteit Utrecht) Anne-Laure Thiel (Université Bourgogne Europe) Francesco Vaccarino (Politecnico di Torino) So Yamagata (Fukuoka University) Registration is available at the *REGISTRATION* <https://indico.sns.it/event/134/> page. Registration is free, although mandatory, due to restrictions on the number of participants. *The deadline for registration is the 30th of April 2026*, and it will be confirmed after expiration. Interested participants can apply for a contributed talk. Limited funding might be available to early registered participants, priority will be given to junior participants and contributed speakers. *The deadline to apply for funding is the 31st of March 2026.* For further questions, please write to cata.organisers(a)gmail.com. Looking forward to seeing you in Pisa. The organizers, Luigi Caputi, Carlo Collari and Giuliamaria Menara

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