Geometria_Pisa

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770 discussions

Seminario oggi
by Bruno Martelli 12 Oct '17

12 Oct '17

Cari, Vi ricordo il seminario di oggi pomeriggio. A presto, Bruno ---- 12-Oct-2017 - 16:00 Sala Seminari (Dip. Matematica) <http://www.dm.unipi.it/webnew/it/aula/sala-seminari-dip-matematica> On corks with low shadow-complexity <http://www.dm.unipi.it/webnew/it/seminari/corks-low-shadow-complexity> Hironobu Naoe (Tohoku University, Japan) A cork is a contractible Stein domain that gives arise to exotic pairs of 4-manifolds. The first example was found by Akbulut. It is known that any two exotic, simply-connected, closed 4-manifolds are related by a cork twist. We show that there are no corks having shadow-complexity zero. We also show that there are infinitely many corks having shadow-conplexity 1 and 2.

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tablet del gruppo
by Carlo Petronio 09 Oct '17

09 Oct '17

Cari geometri, piccolo update sui tablet del gruppo: - quello che ha Camtasia installato (il software di registrazione) ora ce l'ha Rita, e lo lascia quando non lo usa in un posto in studio che dirà lei a chi di voi magari ne avesse bisogno; - quello che non ha Camtasia adesso è nel mio studio, nella borsa color vinaccia nell'armadio, ma io non lo uso, quindi chi vuole può venire a prenderlo; suggerirei però se possibile di mettere Camtasia anche su questo. Filippo ha ritrovato la licenza, che allego. Bisognerebbe provare a vedere se con la stessa licenza si può installare di nuovo. Se ne può occupare qualcuno? Si può anche chiedere aiuto ad Andrea Batistini (passando per help - SID - Polo2 <help.polo2(a)ticket.unipi.it>): è quello più esperto di Windows, ed è molto gentile e competente. Sarebbe meglio farlo subito per non doverlo fare in extremis quando ce n'è bisogno. Ciao, Carlo -------- Messaggio Inoltrato -------- Oggetto: licenza camtasia Data: Wed, 4 Oct 2017 13:15:48 +0200 Mittente: Filippo Callegaro <callegaro(a)dm.unipi.it> A: Carlo Petronio <carlo.petronio(a)unipi.it> Ciao Carlo, questa era la licenza acquistata da Sandra due anni fa per Camtasia. Era un'unica licenza. Non mi ricordo se occorra fare delle operazioni online per registrare la licenza su una macchina (perdendo quindi la possibilità di usare la licenza una seconda volta). Però forse la licenza da diritto ad utilizzare/installare il programma su più macchine? Ciao, Filippo ---------- Messaggio inoltrato ---------- Da: *Sandra Delmoretto* <delmoret(a)dm.unipi.it <mailto:delmoret@dm.unipi.it>> Date: 17 settembre 2015 09:03 Oggetto: Fwd: EVASIONE ORDINE LICENZA CAMTASIA A: Filippo Callegaro <callegaro(a)dm.unipi.it <mailto:callegaro@dm.unipi.it>> Cc: Riccardo Benedetti <benedett(a)dm.unipi.it <mailto:benedett@dm.unipi.it>>, Carlo Petronio <petronio(a)dm.unipi.it <mailto:petronio@dm.unipi.it>>, "aba >> Marco Abate" <abate(a)dm.unipi.it <mailto:abate@dm.unipi.it>>, Cristina Lossi <lossi(a)dm.unipi.it <mailto:lossi@dm.unipi.it>> Buongiorno Filippo, ti giro la Licenza Camtasia acquistata per il Gruppo Geometria. Sandra -------- Messaggio originale -------- Oggetto: EVASIONE ORDINE LICENZA CAMTASIA Data: Thu, 17 Sep 2015 08:55:48 +0200 Mittente: Catia Posillico <catia(a)silverlakete.it> <mailto:catia@silverlakete.it> A: lossi(a)dm.unipi.it <mailto:lossi@dm.unipi.it> CC: Sandra Delmoretto <delmoret(a)dm.unipi.it> <mailto:delmoret@dm.unipi.it>, Fabio Braini <fbraini.silverlakete(a)gmail.com> <mailto:fbraini.silverlakete@gmail.com> In riferimento al vs. ordine Mepa 2334647 del 10/09/2015 Vi inviamo in allegato certificato di Licenza per quanto in oggetto. Cordiali saluti -- /Catia Posillico /*SILVERLAKE TE Srl *Tel. +39 050803040 <tel:050%20803040> Fax +39 050803045 <tel:050%20803045> Cell. 348-1548239 <tel:348%20154%208239> e-mail catia(a)silverlakete.it <mailto:catia@silverlakete.it> This message is for the designated recipient only and may contain privileged or confidential information. If you have received it in error, please notify the sender immediately and delete the original. Any other use of the e-mail by you is prohibited. Questo messaggio è diretto unicamente al destinatario indicato e può contenere informazioni privilegiate o confidenziali. Nel caso sia stato ricevuto per errore, si prega di comunicarlo immediatamente al mittente e di cancellare l'originale. Ogni altro uso della e-mail è proibito. ------------------------------------------------------------------------ Avast logo <https://www.avast.com/antivirus> Questa e-mail è stata controllata per individuare virus con Avast antivirus. www.avast.com <https://www.avast.com/antivirus>

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Seminari oggi e giovedì prossimo
by Bruno Martelli 05 Oct '17

05 Oct '17

Buondì, Vi annuncio che oggi (alle 16) e giovedì prossimo (sempre alle 16) ci saranno due seminari sulle 4-varietà. Seguono più informazioni. A presto, Bruno ---- 05-Oct-2017 - 16:00 Sala Seminari (Dip. Matematica) Rohlin’s theorem and non-simply connected 4-manifolds Danny Ruberman (Brandeis University) Most applications of gauge theory in 4-dimensional topology are concerned with simply-connected manifolds with non-trivial second homology. I will discuss the opposite situation, first describing the classical Rohlin invariant for manifolds with first homology = Z and vanishing second homology. I will give an interpretation in terms of a Seiberg-Witten theory, with an unusual index-theoretic correction term. I will discuss recent work with Jianfeng Lin and Nikolai Saveliev giving a new formula for this invariant in terms of monopole homology. ---- 12-Oct-2017 - 16:00 Sala Seminari (Dip. Matematica) On corks with low shadow-complexity Hironobu Naoe (Tohoku University, Japan) A cork is a contractible Stein domain that gives arise to exotic pairs of 4-manifolds. The first example was found by Akbulut. It is known that any two exotic, simply-connected, closed 4-manifolds are related by a cork twist. We show that there are no corks having shadow-complexity zero. We also show that there are infinitely many corks having shadow-conplexity 1 and 2.

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Fwd: conf october Strasbourg
by Carlo Petronio 19 Sep '17

19 Sep '17

-------- Messaggio Inoltrato -------- Oggetto: conf october Strasbourg Data: Fri, 15 Sep 2017 15:10:14 +0200 Mittente: Olivier Guichard <olivier.guichard(a)math.unistra.fr> A: Carlo Petronio <petronio(a)dm.unipi.it> Dear Carlo, Could you advertise this conf in Pisa ? Thank you in advance, Olivier "Recent Advances in Surface Groups Representations" *Strasbourg* 9-13 october 2017 3 mini-courses by Gabriele Mondello, Greg McShane, Duc-Manh Nguyen Talks by Virginie Charette, Viveka Erlandsson, Tamas Hausel, Victoria Hoskins, Fanny Kassel, Anna Lenzhen, Andrew Sanders, Jérémy Toulisse http://irma.math.unistra.fr/~guichard/leaflet.pdf http://irma.math.unistra.fr/article1639.html

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Fwd: 2 one-year postdoc positions in Mathematics at "Sapienza" University of Rome
by Bruno Martelli 31 Aug '17

31 Aug '17

Borse post-doc a Roma. a presto, Bruno ---------- Forwarded message ---------- From: Mondello, Gabriele <mondello(a)mat.uniroma1.it> Date: Thu, Aug 31, 2017 at 1:05 AM Subject: 2 one-year postdoc positions in Mathematics at "Sapienza" University of Rome To: Dear colleagues, my department has just opened a call for ------------------------------------------------------------ --------------------------------------------------------------- Position: *2 one-year postdoc positions* Institution: *"Sapienza" Università di Roma, Department of Mathematics* Subject: *Mathematics (any)* Salary: *EUR 19367 (gross per year)* Deadline for application: *28 September 2017* Link: https://www2.mat.uniroma1.it/sites/default/files/bando2017-2.pdf ------------------------------------------------------------ --------------------------------------------------------------- Please feel free to forward this announcement to anyone who could be potentially interested. Thank you! Gabriele Mondello -- ------------------------------- *Gabriele Mondello* Dipartimento di Matematica "Sapienza" Università di Roma Piazzale Aldo Moro 5 00185 Roma - Italy Tel: (+39) 06 4991 3283 <06%204991%203283> Email: mondello(a)mat.uniroma1.it -------------------------------

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Fwd: Job Vacancy - Post-Doctoral Fellowship (Neuchatel, Switzerland)
by Bruno Martelli 23 Aug '17

23 Aug '17

Ricevo e volentieri inoltro. Post-doc in Svizzera in geometria. Bruno ---------- Messaggio inoltrato ---------- Da: "Alexander Kolpakov" <kolpakov.alexander(a)gmail.com> Data: 21/ago/2017 19:31 Oggetto: Job Vacancy - Post-Doctoral Fellowship (Neuchatel, Switzerland) A: "Alexander Kolpakov" <kolpakov.alexander(a)gmail.com> Cc: Dear Colleague Herewith I'm pleased to announce a new job vacancy at the Department of Mathematics, University of Neuchâtel, Switzerland. Please find below a description of the aforementioned position. Making this description circulate within your department, and pointing worthy candidates at it would be a great favour. ---------------------------- Job vacancy / Offre d'emploi Contact: Dr. Alexander Kolpakov e-mail: kolpakov.alexander(a)gmail.com (see also enclosed job description) ----------------------------- Within the framework of the Swiss National Science Foundation project ``Higher-dimensional geometric and combinatorial structures'' a Post- Doctoral Fellowship is available. The tentative start date is January, 2018 (or at an earlier convenience). This position has duration of two years (with a one year extension pending financial approval). All candidates must hold a Ph.D., or an equivalent. In addition to their research, the successful candidate is expected to engage in the faculty activities (organising seminars, reading groups for doctoral students, etc) and to seek collaboration with other faculty members. The emphasis of the project is in the areas of hyperbolic geometric, geometric topology, group theory, and related topics (e.g. geometry of polyhedra and manifolds, as well as its connections with Coxeter groups and combinatorics). This position carries a competitive salary which starts at approximately 80'000 CHF per annum (gross income). Application package should include a complete curriculum vitae, a publication list (with pre-prints and accepted papers clearly marked so), and letters of recommendation (no more than three). Preferably all application should be sent by e-mail in order to receive timely consideration. Please bind your application package as a single .pdf file. Only selected candidates will be contacted. --------------------------- Sincerely yours, Alexander Kolpakov

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Fwd: Postdoctoral fellowships in Madrid - valid link
by Bruno Martelli 24 Jul '17

24 Jul '17

Sempre per le borse post-doc a Madrid, qui è il link corretto. Bruno ---------- Forwarded message ---------- From: Javier Aramayona <javier.aramayona(a)uam.es> Date: Fri, Jul 21, 2017 at 12:58 AM Subject: Fwd: Postdoctoral fellowships in Madrid - valid link To: javier.aramayona(a)uam.es Dear all, The link I sent yesterday is broken. See: " https://obrasociallacaixa.org/en/educacion-becas/becas/becas -de-posgrado/becas-postdoctorales-junior-leader/descripcion-del-programa " Go to "open call 2018" and then click on "date de alta" (register). Enter your details to register with the system. Sorry about the confusion and the multiple emails. Regards, Javier

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Fwd: Postdoctoral felloships in Madrid
by Bruno Martelli 20 Jul '17

20 Jul '17

Buondì, Vi giro una mail su delle borse post-doc interessanti a Madrid. Si tratta di "Teoria dei Gruppi" ma visti i nomi è da intendersi in senso molto geometrico/topologico, quindi molti geometri potrebbero partecipare. Bruno ---------- Forwarded message ---------- From: Javier Aramayona <javier.aramayona(a)uam.es> Date: Thu, Jul 20, 2017 at 5:18 AM Subject: Postdoctoral felloships in Madrid To: javier.aramayona(a)uam.es Dear all, The "la Caixa" Foundation has recently advertised a call for 20 postdoctoral fellowships in various areas, including mathematics. The details of the call (in English) can be found at: https://obrasociallacaixa.org/en/educacion-becas/becas/becas -de-posgrado/becas-postdoctorales-junior-leader/descripcion-del-programa The relevant scheme (Incoming Programme) is open to researchers who obtained their Ph.D. at some point between 2 October 2011 and 2 October 2014. The fellowships are of 3 years duration, with a competitive salary, and a generous travel grant. The selection process will be carried out by an external panel of experts, and we expect it will be extremely competitve. We encourage young researchers with interests in the general area of group theory to submit an application. If selected, the applicant would join the Group Theory group at UAM-ICMAT, consisting of: Andrei Jaikin (andrei.jaikin(a)uam.es) : asymptotic group theory, profinite groups, L2 invariants. Javier Aramayona (javier.aramayona(a)uam.es) : mapping class groups, curves on surfaces, Teichmüller spaces. Yago Antolín (yago.antolin(a)uam.es) : geometric and combinatorial group theory, formal languages in finitely-generated groups. We would be grateful if you could forward this information to any interested candidates. Candidates should apply using the online application system that can be found from the link above, indicating that they would like to work within the Group Theory group at ICMAT. Please note that the deadline is 2nd October 2017. Thanks in advance, and best regards, Andrei Jaikin, Javier Aramayona, Yago Antolín

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Seminari dei Baby-Geometri (ultimo doppio appuntamento)
by Marco Moraschini 13 Jun '17

13 Jun '17

Cari tutti, vi segnaliamo un doppio appuntamento dei seminari dei Baby Geometri per Giovedì 15 Giugno che concluderà la sessione di incontri per quest'anno accademico. Di seguito trovate gli speakers e i titoli dei seminari con rispettivi abstract. **Giovedì 15 Giugno ore 15:00 in Aula Riunioni (Dipartimento di Matematica) Sabine Braun (KIT) - L^2-Betti Numbers and Riemannian Volume Abstract: Gromov raised the question whether there is a universal bound for the L^2-Betti numbers of an aspherical manifold by its simplicial volume. A positive answer would yield, in combination with Gromov's main inequality, an upper bound of L^2-Betti numbers of an aspherical manifold by its Riemannian volume provided a lower Ricci curvature bound. While the above conjecture remains open, the implication was shown by Sauer using so-called randomization techniques. After a short introduction to L^2-Betti numbers, I will address the randomization techniques and new developments around curvature-free versions of the main inequality for L^2-Betti numbers. **Giovedì 15 Giugno 16:30 in Aula Riunioni Mirko Mauri (Imperial College London) - Gruppo fondamentale del link di singolarità Abstract: Ogni singolarità (isolata) è omeomorfa al cono sopra il bordo di un suo intorno locale detto link. Una serie di evidenze mostra l’esistenza di una forte connessione tra la topologia del link e la natura algebrica della singolarità. In particolare, una congettura ancora aperta di Kollár afferma che il gruppo fondamentale del link è finito se la singolarità è di tipo klt. Tali singolarità sono di grande rilevanza per il programma dei modelli minimali (MMP). In questa esposizione calcoleremo esplicitamente alcuni esempi e presenterò la strategia induttiva proposta da Zhiyu Tian e Chenyang Xu. Tutti gli interessati sono invitati a partecipare. Per saperne di più sui prossimi seminari scrivete ad uno degli organizzatori o consultate le pagine: http://blog.phc.unipi.it/babygeometri/ http://gecogedi.dimai.unifi.it/seminars/ Mailing-list: babygeom(a)poisson.phc.unipi.it Saluti, Carlo Collari, Marco Moraschini e Nicoletta Tardini

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Seminario geometria oggi ore 15
by Bruno Martelli 24 May '17

24 May '17

buondì, con colpevole ritardo vi annuncio il seminario di geometria di oggi, in aula seminari alle 15. Siete tutti invitati, Bruno ---- 24-May-2017 - 15:00 Sala Seminari (Dip. Matematica) SEMINARI DI GEOMETRIA Gleb Smirnov (International School for Advanced Studies (Trieste)) In his PhD thesis, Paul Seidel found examples of symplectomorphisms which are smoothly isotopic to the identity, but not isotopic to the identity within the symplectomorphism group. These symplectomorphisms are known as Dehn twists, and they exist for those symplectic 4-manifolds which admit an embedded Lagrangian 2-sphere. Later Seidel proved that Dehn twists are of infinite order in the symplectic mapping class groups of certain symplectic K3 surfaces. In spite of this deep result of Seidel, and other results that followed it, we still have no general way to construct non-isotopic symplectomorphisms for 4-manifolds. For instance, there are 4-manifolds which do not contain Lagrangian spheres, yet it is believed that they have a non-trivial symplectic mapping class group. In this talk we will introduce and study a new type of symplectomorphisms for symplectic 4-manifolds and discuss some examples of symplectic 4-manifolds for which these new twists are infinite order elements in the symplectic mapping class groups. This is a joint work with Vsevolod Shevchishin.

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