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[Settimanale] Seminario prof. Ruiz
by Giulia Curciarello 13 Jun '06

13 Jun '06

mercoledi' 21-06-2006 (15:00) - Sala dei Seminari Jesus Ruiz (Universitad Complutense Madrid) : Open questions concernings Hilbert's 17th Problem for analytic curves Abstract The Hilbert 17th Problem asks when a psd function is a sum of squares, and of how many. For real analytic curves this reduces to the local problem for germs at singular points. For those germs, the problem splits into the consideration of their irreducible branches. Now, irreducible curve germs are classically discussed using the semigroup of values: all irreducible curves with fixed semigroup form a "moduli" algebraic set in some finite dimensional affine space. There, Pythagoras numbers, positive semidefinite germs, sum of squares provide semialgebraic mappings on and stratifications of the "moduli" set. The understanding od these semialgebraic data is a difficult matter that has surprising connections with classical concepts (for instance, Arf curves and Pythagorean curves are one and the same thing). ************************* Segreteria Didattica Giulia Curciarello tel- 050 2213219 ************************* _______________________________________________ Settimanale mailing list Settimanale(a)mail.dm.unipi.it https://mail.dm.unipi.it/mailman/listinfo/settimanale

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[Settimanale] SEMINARIO DI SISTEMI DINAMICI OLOMORFI (e dintorni)
by Giulia Curciarello 09 Jun '06

09 Jun '06

SEMINARIO DI SISTEMI DINAMICI OLOMORFI (e dintorni) Martedi' 20 giugno 2006 Sala Conferenze Collegio Puteano > > Corinna ULCIGRAI (Princeton) > ulcigrai(a)math.princeton.edu > "Mixing for flows over interval exchange transformations" > > Abstract: We consider suspension flows over interval > exchange transformations, > under a roof function with logarithmic singularities. Such > flows arise as minimal > components of flows on surfaces given by multi-valued > Hamiltonians. We prove > that if the roof function has an asymmetric logarithmic > singularity, the suspension > flow is strongly mixing for a full measure set of interval > exchanges. This generalizes > a result by Khanin and Sinai for flows over rotations of > the circle. > In the proof we use a recent result by > Avila-Gouzel-Yoccoz. _______________________________________________ Settimanale mailing list Settimanale(a)mail.dm.unipi.it https://mail.dm.unipi.it/mailman/listinfo/settimanale

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[Settimanale] Fw: SNS Cattedra Galileiana 2006 - Yakov G. SINAI
by Giulia Curciarello 08 Jun '06

08 Jun '06

Si trasmette in allegato l'annuncio relativo alla Cattedra Galileiana che avra' inizio lunedi' 12 giugno presso la Scuola Normale. Chi fosse interessato a partecipare e' pregato di restituire il modulo incluso nel pieghevole all'Associazione Amici per fax al no. 050-509179 oppure di inviare un messaggio di posta elettronica con i dati richiesti a amicisns(a)sns.it . Le informazioni contenute nella presente e-mail e nei relativi allegati possono essere riservate e sono, comunque, destinate esclusivamente al destinatario in indirizzo. E' vietata, pertanto, la diffusione, distribuzione e/o copiatura di tali informazioni da parte di qualsiasi soggetto diverso dal destinatario. Chiunque abbia ricevuto o letto questa e-mail per errore o senza esserne legittimato è invitato a darne immediatamente notizia al mittente tramite fax o e-mail e a distruggerla. Grazie. _______________________________________________ Settimanale mailing list Settimanale(a)mail.dm.unipi.it https://mail.dm.unipi.it/mailman/listinfo/settimanale

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[Settimanale] Avvisi di Seminari
by Giulia Curciarello 08 Jun '06

08 Jun '06

I seminari inizieranno alle 15 e proseguiranno con il seguente programma martedi' 13-06-2006 (15:00) - l'Aula Magna del Dipartimento di Matematica "L. Tonelli" Giandomenico Orlandi : One day miniworkshop on Variational Problems:Dynamics of Ginzburg-Landau vortices and critical points of the Kirchhoff functional. Abstract: For the two dimensional complex parabolic Ginzburg-Landau equation we prove that, asymptotically, vortices evolve according to a simple ordinary differential equation, which is a gradient flow of the Kirchhoff-Onsager functional. This convergence holds except for a finite number of times, corresponding to vortex collisions and splittings, which we describe carefully. The only assumption is a natural energy bound on the initial data. martedi' 13-06-2006 (16:00) - l'Aula Magna del Dipartimento Cyrill Muratov : "One day miniworkshop on Variational Problems". A Variational Approach to Front Propagation in Infinite Cylinders. Abstract: Gradient reaction-diffusion-advection systems arise in the context of modeling the kinetics of phase transitions, population dynamics and combustion. These systems are known to exhibit a variety of non-trivial spatio-temporal behaviors, most notably the phenomenon of propagation and traveling waves. We introduce a variational formulation for the traveling wave solutions in cylindrical geometries with transverse potential flow, which allows us to construct a certain class of traveling wave solutions and establish their monotonicity, asymptotic decay and, under some extra assumptions, uniqueness. These solutions are special in a sense that they are characterized by a non-generic fast exponential decay ahead of the wave and play an important role in propagation phenomena for the initial value problem. We also construct an area-type functional that gives a matching upper and lower bound for the propagation speed in the sharp reaction zone limit for weakly curved fronts. ore 17.00 coffe-break martedi' 13-06-2006 (17:30) - l'Aula Magna del Dipartimento "L. Tonelli" Dorin Bucur : "One day miniworkshop on Variational Problems". Shape analysis of the crack inverse problem Abstract: The talk deals with the identifiability of non-smooth defects by boundary measurements, and the stability of their detection. We extend the result of Alessandrini and Valenzuela on the unique determination of a finite number of cracks or cavities by two boundary measurements, to arbitrary closed sets satisfying quasi-everywhere a {\it conductivity assumption}. This new regularity concept is to be compared to the Wiener criterion, rather than to the usual smoothness of the boundary. Relying on the geometric stability of the direct problem, we discuss the stability of the inverse problem without imposing any a priori boundary regularity of the unknown defects. As an application, we give a rigorous justification of the finite elements approximation of the defects. ***************************************************************** lunedi' 19-06-2006 (11:00) - Sala riunioni Irinel Dragan (Dept. of Mathematics, Univ.of Texas at Arlington, USA) : seminari congiunti col DIPART.MATEMATICA APPLICATA: On the Semivalues and the Shapley value for cooperative transferable utility games ******************************************************************* mercoledi' 21-06-2006 (15:00) - Sala dei Seminari Jesus Ruiz (Universitad Complutense Madrid) : Open questions concernings Hilbert's 17th Problem for analytic curves Abstract The Hilbert 17th Problem asks when a psd function is a sum of squares, and of how many. For real analytic curves this reduces to the local problem for germs at singular points. For those germs, the problem splits into the consideration of their irreducible branches. Now, irreducible curve germs are classically discussed using the semigroup of values: all irreducible curves with fixed semigroup form a "moduli" algebraic set in some finite dimensional affine space. There, Pythagoras numbers, positive semidefinite germs, sum of squares provide semialgebraic mappings on and stratifications of the "moduli" set. The understanding od these semialgebraic data is a difficult matter that has surprising connections with classical concepts (for instance, Arf curves and Pythagorean curves are one and the same thing). ******************************* ************************* Segreteria Didattica Giulia Curciarello tel- 050 2213219 ************************* _______________________________________________ Settimanale mailing list Settimanale(a)mail.dm.unipi.it https://mail.dm.unipi.it/mailman/listinfo/settimanale

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[Settimanale] Fw: avviso seminari Prof. Konnov
by Giulia Curciarello 08 Jun '06

08 Jun '06

AVVISO DI SEMINARIO --------------------------------------------------------------- Nei giorni 14 e 15 giugno il Prof. Igor Konnov (Kazan University) terrà 2 seminari nella Sala Seminari del Dipartimento di Matematica Applicata "U. Dini" - Università di Pisa, via Bonanno 25/b, Pisa. 14 giugno ore 10: Combined Relaxation Methods for Variational Inequalities with Single-valued Mappings ABSTRACT: Variational inequalities proved to be a very useful and powerful tool for investigation and solution of many equilibrium type problems in Economics, Engineering,Operations Research and Mathematical Physics. The talk is devoted to a new general approach to constructing solution methods for variational inequalities, which was called the combined relaxation (CR) approach. This approach is based on combining, modifying and generalizing ideas contained in various relaxation methods. We describe the methods for variational inequality problems with single-valued mappings. 15 giugno ore 10: Combined Relaxation Methods for Variational Inequalities with Multi-valued Mappings ABSTRACT: We intend to to describe combined relaxation (CR) methods for variational inequality problems with multi-valued mappings. The basic principles of the CR approach claim that an iteration of most descent methods can serve as a basis for the auxiliary procedure with a regular rule of determining a separating hyperplane and that there are a number of rules for choosing the parameters of both the levels. Following these principles, we now indicate ways of creating various classes of CR methods. We begin our considerations from the mixed variational inequalities which constitute a significant subclass of these problems. ------------------------------------------------------------------ Mauro Passacantando Department of Applied Mathematics Antonella Giacomelli Dipartimento di Matematica Applicata "U.Dini" Via Bonanno Pisano 25 B 56126 - Pisa Tel.: 050 2219452 Fax: 050 2219450 _______________________________________________ Settimanale mailing list Settimanale(a)mail.dm.unipi.it https://mail.dm.unipi.it/mailman/listinfo/settimanale

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[Settimanale] Fw: Conferenza di Matematica, Prof. Aroldo Kaplan (08.06.06)
by Giulia Curciarello 08 Jun '06

08 Jun '06

Conferenza di MATEMATICA Giovedì 8 giugno 2006 ore 15.00 Scuola Normale Superiore Pisa (Aula Fermi) Aroldo Kaplan Università Nazionale di Cordoba (Argentina) Terrà una conferenza dal titolo: "The Hodge Conjecture" Abstract An introduction to this celebrated problem, in the language of Calculus on Manifolds suited for a general audience. Tutti gli interessati sono invitati a partecipare. La Segreteria della Classe di Scienze - - - - - Michele Verde Scuola Normale Superiore Segreteria Classe di Scienze Tel. 050-509048 Fax. 050-509045 Piazza Dei Cavalieri, 7 56126 Pisa E-Mail: m.verde(a)sns.it E-Mail: segreteria.scienze(a)sns.it - - - - - Le informazioni contenute nella presente e-mail e nei relativi allegati possono essere riservate e sono, comunque, destinate esclusivamente al destinatario in indirizzo. E' vietata, pertanto, la diffusione, distribuzione e/o copiatura di tali informazioni da parte di qualsiasi soggetto diverso dal destinatario. Chiunque abbia ricevuto o letto questa e-mail per errore o senza esserne legittimato è invitato a darne immediatamente notizia al mittente tramite fax o e-mail e a distruggerla. Grazie. _______________________________________________ Settimanale mailing list Settimanale(a)mail.dm.unipi.it https://mail.dm.unipi.it/mailman/listinfo/settimanale

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[Settimanale] Arnaud Debussche, "Introduction to dispersive SPEs"
by Giulia Curciarello 08 Jun '06

08 Jun '06

> CENTRO DI RICERCA MATEMATICA ENNIO DE GIORGI > > Nell'ambito del semestre su "Stochastic Analysis, Stochastic PDE and > Applications to Fluid Dynamics and Particle Systems", il Prof. ARNAUD > DEBUSSCHE (IRMAR and ENS de Cachan) terra' un corso dal titolo: > > "Introduction to dispersive SPEs" > > ABSTRACT: > In these series of lectures, I will describe mathematical aspects of > stochastic dispersive PDEs with a particular emphasis on the Nonlinear > Schrodinger Equations (NLS). > I will start from the very beginning and explain how the Strichartz > estimates allow to solve these equations in the simple case of the > stochastic NLS equation with an additive noise. These tools will then be > used to study the multiplicative noise case. > Once basic well-posedness results are established, we will explain some > aspects on the qualitative influence of a noise on blow-up phenomena in > the case of a critical or supercritical nonlinearity and show that a > spatially smooth noise has a strong effect. > Then, we will prove large deviation estimates and show how these can be > used to estimate the probability errors in soliton transmission in > optical fibers. > Some qualitative aspects being difficult to study theoretically, > numerical simulations are sometimes used and it is important to study > the schemes. I will therefore devote some lectures to the numerical > analysis of the stochastic NLS equations and explain how the associated > infinite dimensional Kolmogorov equation is used to study the weak order > of a scheme. > Finally, depending on the time spent on the preceding topics, I will > adress some problems related to the Korteweg-de Vries equation and the > associated solitons when a noise perturbs the dynamics. > > CALENDARIO: > Lunedi' 12 Giugno, 14-30-16-30 > Lunedi' 19 Giugno, 14-30-16-30 > Venerdi' 23 Giugno, 14-30-16-30 > Lunedi' 26 Giugno, 14-30-16-30 > Venerdi' 30 Giugno, 14-30-16-30 > Lunedi' 3 Luglio, 10.30-12.30 > Venerdi' 7 Luglio, 10.30-12.30 > Lunedi' 10 Luglio, 10.30-12.30 > Lunedi' 17 Luglio, 10.30-12.30 > Venerdi' 21 Luglio,, 10.30-12.30 > > Le lezioni si terranno nella Sala Conferenze del Collegio Puteano > (Piazza dei Cavalieri 3, PISA). > > Tutti gli interessati sono invitati a partecipare. _______________________________________________ Settimanale mailing list Settimanale(a)mail.dm.unipi.it https://mail.dm.unipi.it/mailman/listinfo/settimanale

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[Settimanale] You have the experience but lack the proper University Degree.
by Keven Lowry 07 Jun '06

07 Jun '06

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[Settimanale] SNS Cattedra Galileiana 2006 - Yakov G. SINAI
by Caterina D'elia 06 Jun '06

06 Jun '06

Si trasmette in allegato l'annuncio relativo alla Cattedra Galileiana che avra' inizio lunedi' 12 giugno presso la Scuola Normale. Chi fosse interessato a partecipare e' pregato di restituire il modulo incluso nel pieghevole all'Associazione Amici per fax al no. 050-509179 oppure di inviare un messaggio di posta elettronica con i dati richiesti a amicisns(a)sns.it . Cordiali saluti, Caterina D'Elia _____________________ Caterina D'Elia Scuola Normale Superiore Classe di Scienze Responsabile Segreteria scientifica e amministrativa Piazza dei Cavalieri 7 56100 PISA Tel. ++39--050.509203 Fax ++39-050-509045 Le informazioni contenute nella presente e-mail e nei relativi allegati possono essere riservate e sono, comunque, destinate esclusivamente al destinatario in indirizzo. E' vietata, pertanto, la diffusione, distribuzione e/o copiatura di tali informazioni da parte di qualsiasi soggetto diverso dal destinatario. Chiunque abbia ricevuto o letto questa e-mail per errore o senza esserne legittimato è invitato a darne immediatamente notizia al mittente tramite fax o e-mail e a distruggerla. Grazie. _______________________________________________ Settimanale mailing list Settimanale(a)mail.dm.unipi.it https://mail.dm.unipi.it/mailman/listinfo/settimanale

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[Settimanale] Avvisi seminari Sinai
by Giulia Curciarello 05 Jun '06

05 Jun '06

> Si tratta dei seminari di Sinai > alla normale la settimana prossima > info: http://amicisns.sns.it/annuncio_cattedra.htm > ########################################################################## > SCUOLA NORMALE SUPERIORE ASSOCIAZIONE AMICI DELLA SCUOLA NORMALE SUPERIORE > > CATTEDRA GALILEIANA 2006 > > Yakov G. Sinai > > University of Princeton > > A Course on: > > Selected Problems from Fluid Dynamics > > Lectures will be given at the Scuola Normale Superiore di Pisa, Aula > Ulisse Dini (Palazzo del Castelletto), according to the following > schedule: > > > Monday, June 12th 11.00 12.30 > Tuesday, June 13th 11.00 12.30 > Wednesday, June 14th 11.00 12.30 > Thursday, June 15th 11.00 12.30 > Friday, June 16th 11.00 12.30 > Monday, June 19th 11.00 12.30 > Tuesday, June 20th 11.00 12.30 > > > Participation is open. Please send your Registration form to: > Associazione Amici della Scuola Normale Superiore, > Scuola Normale Superiore, > Piazza dei Cavalieri 7 > 56126 Pisa. > > For information please contact: > tel. 050509654 ? fax: 050509179 > ########################################################################## > _______________________________________________ Settimanale mailing list Settimanale(a)mail.dm.unipi.it https://mail.dm.unipi.it/mailman/listinfo/settimanale

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