- Geometria_Pisa - Mailing list — Dipartimento di Matematica, UniPI

Reading group on Algebra and Geometry of quantum link homologies
by Carlo Collari 11 Oct '25

11 Oct '25

Dear all, We would like to advertise a reading group on the relations between knot homologies (Khovanov-Rozansky homologies), algebraic geometry and representation theory. The plan is to follow the survey article by Gorsky-Kivinen-Simental (you can find it attached), based on the Lecture Notes of IHES summer school of 2021, adding some more context and background. The seminars should be accessible to a broad audience without prior knowledge of knot theory or algebraic geometry. The reading group will consist of 2h talks given by the participants. A preliminary encounter will be held online on Wednesday October 15 at 16:00 (CEST) at the following link: Argomento: Preliminary meeting lecture group KR Ora: 15 ott 2025 03:45 PM Roma Entra nella riunione in Zoom https://sissa-it.zoom.us/j/87888698027?pwd=QTC9PP0fX7zNkFsRDNjNvvadnBrYIK.1 ID riunione: 878 8869 8027 Codice d’accesso: 757115 During this meeting we will decide the subdivision of the talks (we estimate 10-12 talks) and the schedule. Those who are interested but cannot attend the preliminary meeting are encouraged to write to us. All the best, Valentina Bais, Carlo Collari, Lucrezia Beatrice Lorenzi.

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Fwd: [Junk released by Allowed List] [CENTRO DE GIORGI] -- ANNOUNCEMENT -- COLLOQUIO DE GIORGI - PROF. SERGE CANTAT (October 8th, 2025)
by Bruno Martelli 26 Sep '25

26 Sep '25

Buondì, Mi permetto di consigliare a tutti la presenza a questo seminario. Cantat è uno speaker eccellente. Buno ---------- Forwarded message --------- Da: CRM <crm(a)sns.it> Date: gio 25 set 2025 alle ore 12:05 Subject: [Junk released by Allowed List] [CENTRO DE GIORGI] -- ANNOUNCEMENT -- COLLOQUIO DE GIORGI - PROF. SERGE CANTAT (October 8th, 2025) To: <crm(a)sns.it> Cc: <crm(a)sns.it> *Colloquio De Giorgi* *8* *October** 2025 ore 4:00 pm* Aula Dini, Palazzo del Castelletto, via del Castelletto, Pisa <https://www.google.it/maps/place/Palazzo+del+Castelletto/@43.7183335,10.398…> Prof. *SERGE* *CANTAT* Université de Rennes Title: *Degree Growth * Abstract : Consider a polynomial transformation f of a vector space V and iterate f; that is, compose f with itself, and then with f again, etc. Doing so, one gets a sequence of polynomial transformations f^n. Computing the degree of the formulas defining f^n, one obtains a sequence of integers deg(f^n). The problem I will discuss is : what type of sequences do we obtain in this way? For instance, in dimension 2, the degree of f(x,y)=(y,xy) is 2, then the degree of f^2(x,y)=(xy, xy^2) is 3, then f^3(x,y)=(xy^2,x^2y^3) has degree 5, … and the degree of f^n is given by a sequence which is well known in Pisa. The question is related to dynamical systems, basic algebraic geometry, and some number theory. No previous knowledge will be assumed. *Web site: *https://crmdegiorgi.sns.it/evento/colloquio-de-giorgi-2024-2025/ *The event will take place in person.* Those who are unable to be physically present may attend the talk via zoom by following the link: *https://us02web.zoom.us/j/81126340951?pwd=cUQ2SldDK0xKU3hqdENEU3FiUXNkUT09 <https://us02web.zoom.us/j/81126340951?pwd=cUQ2SldDK0xKU3hqdENEU3FiUXNkUT09>* *Luisa Ferrini* *Centro di Ricerca Matematica* Ennio De Giorgi Palazzo Puteano Piazza <https://www.google.com/maps/search/Piazza+dei+Cavalieri+3?entry=gmail&sourc…> <https://www.google.com/maps/search/Piazza+dei+Cavalieri+3?entry=gmail&sourc…> dei <https://www.google.com/maps/search/Piazza+dei+Cavalieri+3?entry=gmail&sourc…> <https://www.google.com/maps/search/Piazza+dei+Cavalieri+3?entry=gmail&sourc…> Cavalieri <https://www.google.com/maps/search/Piazza+dei+Cavalieri+3?entry=gmail&sourc…> 3 <https://www.google.com/maps/search/Piazza+dei+Cavalieri+3?entry=gmail&sourc…> 56126 PISA

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Seminario Martedì 30 Settembre - François Bacher
by Filippo Sarti 25 Sep '25

25 Sep '25

Buongiorno, Vi segnalo che François Bacher (Dijon) terrà il prossimo seminario di Geometria in data Martedì 30 Settembre alle ore 14:30 presso l'aula Seminari. Per gli interessati ad andare a pranzo con lo speaker, potete contattare Fabrizio Bianchi (in copia). L'appuntamento è in atrio alle 12:45. Allego titolo e abstract. Titolo: Hénon maps and Kato surfaces Abstract: Friedland and Milnor showed that among the polynomial automorphisms of the affine complex plane, the only ones dynamically non-trivial are the Hénon maps. Considering their birationnal extension to the projective plane, these maps admit a super-attracting point at infinity. Dloussky and Oeljeklaus noticed that one could compactify the quotient by the dynamics of its basin of attraction into a Kato surface. I will recall the construction of such surfaces, and talk about a recent result, according to which the obtained Kato surface completely characterizes the Hénon automorphism; conversely, one obtains the description of the space of Kato surfaces coming from Hénon maps. A presto, Filippo

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Fw:
by Paolo Lisca 20 Aug '25

20 Aug '25

Giro questo annuncio per gli eventuali interessati. Paolo Lisca ________________________________ From: Marc Kegel <kegelmarc87(a)gmail.com> Dear all, I’m starting a new position in Seville this September. It’s not permanent, but it runs for five years, so at least there’s a bit of stability! As part of the position, I’ve received funding to organize scientific events. Together with Marithania Silvero, I’m planning a small workshop on branched covers in Seville, scheduled for November 17–21, 2025. Motivation We’ve noticed that many younger researchers in our field (including ourselves) are familiar with modern invariants like Khovanov homology and Heegaard Floer theory, but often have little exposure to more classical topics such as branched covers. Our aim is to revisit the foundations through accessible, in-depth lectures by leading experts. Planned format * Morning: Lecture series by 2–3 invited speakers * Afternoon: Group discussions exploring the lectures and brainstorming small research projects * Late afternoon: Short participant talk to cap off the day The atmosphere will be informal and collaborative, with a small group to encourage interaction and discussion. We also hope the workshop will spark new collaborations and ideas. I already have a list of interesting questions, and more will certainly arise during the lectures. Confirmed / tentative speakers for the minicourses * Luisa Paoluzzi – Knot detection via branched covers: in what sense a knot is or isn’t determined by its branched covers. * Marco Golla (to be confirmed) – Applications of branched covers, based on his lecture notes (https://www.math.sciences.univ-nantes.fr/~golla/docs/courses/notes_0401.pdf…) * Third speaker (possibly me) – Proof that every 3-manifold is a 3-fold branched cover of a knot in S3, the existence of universal links (i.e. a link L in S3 such that every 3-manifold arises as a branched cover over L), and a complete set of moves for branched covers. Funding We expect to cover shared-room accommodation for participants. Unfortunately, we will likely not be able to support travel costs. Interested? If you’d like to join, please: 1. Mark the week in your calendar, and 2. Email me briefly, indicating whether you would like accommodation covered. Please do not book travel yet — I’ll confirm exact funding details and the final participant list in September, possibly with a simple webpage. Looking forward to hearing from you! All the best, Marc

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Seminario Giovedì 17 Luglio - Muhan Luo
by Carlo Collari 14 Jul '25

14 Jul '25

Buongiorno, Vi segnalo che Muhan Luo (National University of Singapore) terrà il prossimo seminario di Geometria in data Giovedì 17 Luglio alle ore 14:30 presso l'aula Riunioni. Per gli interessati ad andare a pranzo con lo speaker, potete contattare Fabrizio Bianchi (in copia). L'appuntamento è in atrio alle 12:45. Allego titolo e abstract Titolo: Equidistribution of saddle periodic points of Henon-like maps Abstract: We prove that under the natural assumption over the dynamical degrees, the saddle periodic points of a Henon-like map in any dimension equidistribute with respect to the equilibrium measure. Our work generalizes results of Bedford-Lyubich-Smillie, Dujardin and Dinh-Sibony along with improvements of their techniques. We also investigate some fine properties of Green currents associated with the map. This is a joint work with Qi Zhou. A presto Carlo

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Seminario di Geometria Martedì 24 Giugno - Alfonso Tortorella
by Carlo Collari 23 Jun '25

23 Jun '25

Buongiorno, Vi ricordo che il prossimo seminario di Geometria e Topologia sarà tenuto da Alfonso Tortorella (Università di Salerno) e si terrà Martedì 24 Giugno alle ore 14:30 presso l'aula Seminari. Per gli interessati ad andare a pranzo con lo speaker, l'appuntamento è in atrio alle 12:45. In allegato titolo e abstract Titolo: Deformations of Symplectic Foliations Abstract: In this talk, based on joint work with Stephane Geudens and Marco Zambon, we develop the deformation theory of symplectic foliations, i.e. regular foliations equipped with a leafwise symplectic form. The main result is that each symplectic foliation is attached with a cubic L-infinity algebra controlling its deformation problem. Indeed, we establish a one-to-one correspondence between the small deformations of a given symplectic foliation and the Maurer–Cartan elements of the associated L-infinity algebra. Further, we prove that, under this one-to-one correspondence, the equivalence by isotopies of symplectic foliations agrees with the gauge equivalence of Maurer–Cartan elements. Finally, we show that the infinitesimal deformations of symplectic foliations can be obstructed. A presto, Carlo e Filippo

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Seminario di Geometria Mercoledì 18 Giugno - Pietro Capovilla
by Filippo Sarti 16 Jun '25

16 Jun '25

Buongiorno, Vi ricordo che il prossimo seminario di Geometria e Topologia sarà tenuto da Pietro Capovilla e si terrà Mercoledì 18 Giugno alle ore 14:30 presso l'aula Seminari. Per gli interessati ad andare a pranzo con lo speaker, l'appuntamento è in atrio alle 12:45. Allego titolo e abstract Titolo: Combination theorems for open covers Abstract: The generalized Lusternik-Schnirelmann category of a space is the minimal cardinality of open covers by subsets whose fundamental group is contained in a given family of groups. The goal of this talk is to present a combination theorem for generalized LS-categories of groups G in terms of the stabilizers of contractible CW-complex equipped with an action by G. This fact has applications to the geometric dimensions of groups and to the simplicial volume of manifolds obtained by gluing. A presto, Carlo e Filippo

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Fwd: [rtop] Geometric Topology Meeting Grenoble August 2025 (Last announcement)
by Bruno Martelli 12 Jun '25

12 Jun '25

---------- Forwarded message --------- Da: wagner(a)imj-prg.fr <wagner(a)imj-prg.fr> Date: gio 12 giu 2025 alle ore 03:25 Subject: [rtop] Geometric Topology Meeting Grenoble August 2025 (Last announcement) To: rtop(a)listes.math.cnrs.fr <rtop(a)listes.math.cnrs.fr> Dear colleagues, We are pleased to invite you to the annual geometric topology meeting of the Réseau Rtop. It will be held at the Institut Fourier, Grenoble, August 25-29. We will have mini-courses by: - David Gay. Title: 5-dimensional parameterized Morse theory and diffeomorphisms of 4-manifolds - Anthony Genevois. Title: Introduction to the coarse topology of lamplighters and one-hour talks by : - Naomi Andrew, - Jules Martel, - Jean Raimbault, - Anne-Laure Thiel, - Vera Vértesi. The website is https://jtg-2025.sciencesconf.org/. You can already register and possibly propose a short talk. The deadline for registration is June 20; confirmation will be given shortly after. Best wishes, François, Emmanuel and Delphine

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Workshop Montreal - Hyperbolic manifolds in dimensions 4 (and more)
by Bruno Martelli 09 Jun '25

09 Jun '25

Buondì, Segnalo il workshop "Hyperbolic manifolds in dimensions 4 (and more)" https://www.crmath.ca/en/activities/#/type/activity/id/4016 Mi dicono gli organizzatori che hanno fondi disponibili per i partecipanti. A presto, Bruno

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Seminario di Geometria Martedì 10 Giugno 2025 - Pietro Capovilla
by Filippo Sarti 09 Jun '25

09 Jun '25

Buongiorno, Vi ricordo che il prossimo seminario di Geometria e Topologia sarà tenuto da Pietro Capovilla e si terrà Martedì 10 Giugno alle ore 14:30 presso l'aula Riunioni. Per gli interessati ad andare a pranzo con lo speaker, l'appuntamento è in atrio alle 12:45. Allego titolo e abstract Titolo: Combination theorems for open covers Abstract: The generalized Lusternik-Schnirelmann category of a space is the minimal cardinality of open covers by subsets whose fundamental group is contained in a given family of groups. The goal of this talk is to present a combination theorem for generalized LS-categories of groups G in terms of the stabilizers of contractible CW-complex equipped with an action by G. This fact has applications to the geometric dimensions of groups and to the simplicial volume of manifolds obtained by gluing. A presto, Carlo e Filippo

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