Geometria_Pisa

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Annuncio Seminario Caputi
by Carlo Collari 12 Apr '22

12 Apr '22

Buongiorno a tutti, inoltro l'annuncio del seminario di Luigi Caputi che si terrà domani (13 Aprile 2022) alle 16:00 nell'Aula Magna del Dipartimento. In allegato titolo e abstract Saluti, Carlo Collari Titolo: Coarse Homology Theories Relatore: Luigi Caputi (University of Aberdeen) Abstract: Coarse spaces, first introduced by J. Roe for studying index-type theorems, have recently found applications also in K-theory and assembly map conjectures. The main tool in such applications is given by coarse homology theories, homological invariants of coarse spaces. Goal of the talk is to define coarse homology theories using the homotopical approach developed by U. Bunke and A. Engel. The main example will be coarse algebraic K-theory.

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[Indico] Logarithmic Comparison Theorems for Hyperplane Arrangements, Twisted or Otherwise, Dan Bath, 08/04/2022, 15:00 Europe/Rome
by francesco.sala＠unipi.it 07 Apr '22

07 Apr '22

Title: Logarithmic Comparison Theorems for Hyperplane Arrangements, Twisted or Otherwise, Speaker(s): Dan Bath, KU Leuven, Date and time: 8 Apr 2022, 15:00 (Europe/Rome), Lecture series: Seminar on Combinatorics, Lie Theory, and Topology, Venue: Department of Mathematics (Aula Riunioni). You can access the full event here: https://events.dm.unipi.it/e/88 -- Indico :: Email Notifier https://events.dm.unipi.it/e/88

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[Indico] Logarithmic Comparison Theorems for Hyperplane Arrangements, Twisted or Otherwise, Dan Bath, 08/04/2022, 15:00 Europe/Rome
by francesco.sala＠unipi.it 06 Apr '22

06 Apr '22

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Fwd: [gdrtresses] Conference "Three day summer school on The Geometry and Dynamics of Moduli Spaces"
by Bruno Martelli 05 Apr '22

05 Apr '22

---------- Forwarded message --------- From: wagner(a)imj-prg.fr <wagner(a)imj-prg.fr> Date: Tue, Apr 5, 2022 at 11:35 AM Subject: [gdrtresses] Conference "Three day summer school on The Geometry and Dynamics of Moduli Spaces" To: gdrtresses(a)listes.math.cnrs.fr <gdrtresses(a)listes.math.cnrs.fr> Conference "Three day summer school on The Geometry and Dynamics of Moduli Spaces" We are announcing a short school in Geometry ad Dynamics of Moduli Spaces, to be held in June in Bologna. Here the web page: https://site.unibo.it/geometry-dynamics-summer-school-2022/en Registration is free but mandatory, here https://site.unibo.it/geometry-dynamics-summer-school-2022/en/registration

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[Indico] Lecture: Variation of stable birational type and bounds for complete intersections (06/04/2022, 14:30 Europe/Rome)
by francesco.sala＠unipi.it 05 Apr '22

05 Apr '22

Title: Variation of stable birational type and bounds for complete intersections, Speaker(s): Johannes Nicaise, KU Leuven and Imperial College London, Date and time: 6 Apr 2022, 14:30 (Europe/Rome), Lecture series: Algebraic and Arithmetic Geometry Seminar, Venue: Dipartimento di Matematica (Aula Magna). You can access the full event here: https://events.dm.unipi.it/e/69 Abstract -------- This talk is based on joint work with John Christian Ottem. I will explain a generalization of results by Shinder on variation of stable birational types in degenerating families, and how this can be used to extend Schreieder's non-stable rationality bounds from hypersurfaces to complete intersections in characteristic zero. This technique yields new results already for complete intersections of quadrics. -- Indico :: Email Notifier https://events.dm.unipi.it/e/69

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Fwd: [gdrtresses] Conference: "Complex Hyperbolic geometry and related topics"
by Bruno Martelli 29 Mar '22

29 Mar '22

---------- Forwarded message --------- From: wagner(a)imj-prg.fr <wagner(a)imj-prg.fr> Date: Mon, Mar 28, 2022 at 8:29 AM Subject: [gdrtresses] Conference: "Complex Hyperbolic geometry and related topics" To: gdrtresses(a)listes.math.cnrs.fr <gdrtresses(a)listes.math.cnrs.fr> We are organising a conference "Complex Hyperbolic geometry and related topics" at the CIRM, in Luminy, from 4 to 8th of July 2022, in honor of ELisha Falbel. You are warmly welcome to participate and promote this event. The preregistration is open at https://conferences.cirm-math.fr/2622.html The deadline for registration is 6 of June. Limited financial support is available mostly intended for PhD students and young researchers.

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[Indico] Lecture: Local positivity and effective Diophantine approximation (23/03/2022, 14:30 Europe/Rome)
by francesco.sala＠unipi.it 22 Mar '22

22 Mar '22

Title: Local positivity and effective Diophantine approximation, Speaker(s): Matthias Nickel, Pisa, Date and time: 23 Mar 2022, 14:30 (Europe/Rome), Lecture series: Algebraic and Arithmetic Geometry Seminar, Venue: Dipartimento di Matematica (Aula Magna). You can access the full event here: https://events.dm.unipi.it/e/74 Abstract -------- In this talk I will discuss a new approach to prove effective results in Diophantine approximation relying on lower bounds of Seshadri constants. I will then show how to use it to prove an effective theorem on the simultaneous approximation of two algebraic numbers satisfying an algebraic equation -- Indico :: Email Notifier https://events.dm.unipi.it/e/74

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Seminario mercoledì ore 16
by Bruno Martelli 21 Mar '22

21 Mar '22

Buondì, Con colpevole ritardo, segnalo un seminario di geometria per mercoledì prossimo (dopodomani). A presto, Bruno SEMINARI DI GEOMETRIA 23-Mar-2022 - 16:00 Aula Magna - Dipartimento di Matematica Titolo: An arithmetic, hyperbolic, rational homology 3-sphere that bounds geometrically Leonardo Ferrari, Neuchatel (Svizzera) Abstract: In this seminar, we'll introduce Davis and Januszkiewicz combinatorial techniques for building manifolds from right-angled polytope, as well as some topological properties inherited by these manifolds. We'll then present some obstructions to producing rational homology 3-spheres (QHS3) in this setting, and explain how to use these obstructions to improve tree-search algorithms for hyperbolic QHS3. We'll finally explain how to promote geodesical embeddings to geometrical bounds, and combine these tools to construct the first example of a hyperbolic, arithmetic, QHS3 that bounds geometrically.

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Fwd: [SPAM]Conference announcement
by Bruno Martelli 16 Mar '22

16 Mar '22

---------- Forwarded message --------- From: Costantino <francesco.costantino(a)math.univ-toulouse.fr> Date: Tue, Mar 15, 2022 at 10:23 PM Subject: [SPAM]Conference announcement To: Bruno Martelli <bruno.martelli(a)unipi.it>, Roberto Frigerio < roberto.frigerio(a)unipi.it>, Stefano Francaviglia < stefano.francaviglia(a)unibo.it>, Carlo Petronio <carlo.petronio(a)unipi.it>, Gabriele Mondello <mondello(a)mat.uniroma1.it>, Francesco Bonsante < bonfra07(a)unipv.it> Dear all We are organising a conference in honor of Vladimir Turaev: Quantum Topology and Geometry in Paris, Institut Henri Poincaré from 13t to 17th of June 2022. You are warmly welcome to participate and promote this event. The registration is open at https://www.mathconf.org/qtg2022. The deadline for registration is 30th of April (31th of march for demands of financial suport for students and post-docs). The poster is attached to this email. For information concerning the covid travel regulation in France please visit: https://www.interieur.gouv.fr/covid-19-international-travel Our best wishes Alexis Virelizier, Christian Blanchet, Emmanuel Wagner, François Costantino and Nathan Geer

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[Indico] [Event reminder] Two results about Grothendieck's Section Conjecture (16/03/2022, 14:30 Europe/Rome)
by francesco.sala＠unipi.it 15 Mar '22

15 Mar '22

Please note that the event "Two results about Grothendieck's Section Conjecture" will start on 16 Mar 2022, 14:30 (Europe/Rome). It will take place at Dipartimento di Matematica (Aula Magna). You can access the full event here: https://indico.cs.dm.unipi.it/e/73 Description ----------- Grothendieck's Section Conjecture states that, if $X$ is an hyperbolic curve over a field $k$ finitely generated over $\mathbb{Q}$, every section of the map $\pi_1(X) \to \mathsf{Gal}(k)$ is associated with a rational point of the completion of $X$. After summarizing the main known facts concerning the conjecture, we will present two new results. First, we generalize to number fields a theorem which was proved over $\mathbb{Q}$ by Stix: we prove that if $k$ is a number field and the Weil restriction of $X$ to $\mathbb{Q}$ admits a rational map to a non-trivial Brauer-Severi variety, then $X$ satisfies the conjecture. Secondly, if $k$ is finitely generated over $\mathbb{Q}$, we prove that the conjecture holds for sections which satisfy a strong birationality assumption. In particular, this implies that the section conjecture is equivalent to Esnault and Hai's cuspidalization conjecture, which states that every Galois section of every hyperbolic curve $X$ lifts to every open subset of $X$. -- Indico :: Email Notifier https://indico.cs.dm.unipi.it/e/73

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