June 2006 - Notiziario - Mailing list — Dipartimento di Matematica, UniPI

[Settimanale] Passed up for the promotion..again?
by Lonnie Askew 27 Jun '06

27 Jun '06

Obtain your diploma, bachelors' or Masters' in 2 weeks time from prestigious non-accredited universities based on your present knowledge and life experience. No tests, exams or classes require. Call us now to receive yours today! 1-509-355-1567 Confidentiality Assured _______________________________________________ Settimanale mailing list Settimanale(a)mail.dm.unipi.it https://mail.dm.unipi.it/mailman/listinfo/settimanale

1 0

[Settimanale] avvisi di seminari
by Giulia Curciarello 27 Jun '06

27 Jun '06

27/06 Aula seminari ore 15 J.M. Schlenker (Universite' Paul Sabatier, Toulouse) Titolo: "3-dimensional manifolds with particles". Abstract: A "particle" in a 3-dimensional hyperbolic 3-manifold is a cone singularity along an infinite line, with an angle which is less than $\pi$. There is a natural notion of quasi-Fuchsian manifold with particles, and those appear to share many of the striking geometric properties of (non-singular) quasi-Fuchsian 3-manifolds. We will describe some examples of properties which can be extended to this context. Quasi-Fuchsian 3-manifolds with particles also have a Lorentzian counterpart, GHMC AdS manifolds with particles, to which some properties of Mess' GHMC AdS manifolds can be extended. 29/06 Aula riunioni ore 15 G. Mondello (MIT) Titolo: Cicli di Witten sullo spazio dei moduli delle superfici di Riemann Abstract: Ogni presentation dello spazio dei moduli delle superfici di Riemann da` origini a classi caratteristiche "naturali". Dal punto di vista algebro-geometrico, esse sono le cosiddette classi tautologiche. D'altra parte, la decomposizione cellulare dello spazio dei moduli per mezzo di grafi a nastro consente di definire cicli combinatorici interessanti, che sono anche chiamati cicli di Witten. Lo scopo del seminario e` di illustrare alcune idee della dimostrazione della congettura di Witten-Kontsevich (i cicli combinatorici sono tautologici) e, se il tempo lo consente, accennare a possibili applicazioni e generalizzazioni. ************************* Segreteria Didattica Giulia Curciarello tel- 050 2213219 ************************* _______________________________________________ Settimanale mailing list Settimanale(a)mail.dm.unipi.it https://mail.dm.unipi.it/mailman/listinfo/settimanale

1 0

[Settimanale] Rose
by Broglia 24 Jun '06

24 Jun '06

_______________________________________________ Settimanale mailing list Settimanale(a)mail.dm.unipi.it https://mail.dm.unipi.it/mailman/listinfo/settimanale

1 0

[Settimanale] Fw: Avviso Seminario di Matematica, prof. David W. MASSER (06.07.06)
by Giulia Curciarello 22 Jun '06

22 Jun '06

SEMINARIO DI MATEMATICA Giovedì 6 luglio 2006 ore 16.00 Scuola Normale Superiore Pisa (Aula Tonelli) David W. MASSER Università di Basilea Terrà un seminario dal titolo: "Linear equations in multiplicative groups over positive characteristic" Abstract The equation $a_1x_1+...+a_nx_n=1$, to be solved in unknowns $x_1,...,x_n$ lying in a fixed multiplicative group, has been much studied in the case of zero characteristic. However there are not many results over positive characteristic. This case is generally easier to handle, but it presents interesting new features. For example, although the equation can have infinite $(n-2)$-parameter families of solutions, these can be classified and estimated in a completely effective way. This has applications to multiple mixing problems for algebraic actions on disconnected compact abelian groups. 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

1 0

[Utenti] [Settimanale] Seminario prof. Ruiz (fwd)
by Francesca Acquistapace 16 Jun '06

16 Jun '06

Prego notare l'ora Grazie Francesca Acquistapace mercoledi' 21-06-2006 Ore 15:00 PRECISE - 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 _______________________________________________ Utenti mailing list Utenti(a)mail.dm.unipi.it https://mail.dm.unipi.it/mailman/listinfo/utenti _______________________________________________ Settimanale mailing list Settimanale(a)mail.dm.unipi.it https://mail.dm.unipi.it/mailman/listinfo/settimanale

1 0

[Settimanale] SEMINARIO DI SISTEMI DINAMICI OLOMORFI (e dintorni)
by Giulia Curciarello 15 Jun '06

15 Jun '06

SEMINARIO DI SISTEMI DINAMICI OLOMORFI (e dintorni) Martedi' 20 giugno 2006 0re 14.30 Sala Conferenze Collegio Puteano Corinna ULCIGRAI (Princeton) "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. ************************* Segreteria Didattica Giulia Curciarello tel- 050 2213219 ************************* _______________________________________________ Settimanale mailing list Settimanale(a)mail.dm.unipi.it https://mail.dm.unipi.it/mailman/listinfo/settimanale

1 0

[Settimanale] Fw: Colloquio De Giorgi, Prof. Lucien SZPIRO (21.06.06)
by Giulia Curciarello 15 Jun '06

15 Jun '06

COLLOQUIO DE GIORGI Lucien SZPIRO Graduate Center CUNY NewYork "Algebraic Dynamics" Abstract Preperiodic points over number fields and function fields, Equidistribution of small points, Critical bad reduction and a Shafarevich-Faltings finitness theorem for dynamics on the projective line. Mercoledì 21 giugno 2006 ore 17.00 Aula Mancini Piazza dei Cavalieri,7 PISA _______________________________________________ Settimanale mailing list Settimanale(a)mail.dm.unipi.it https://mail.dm.unipi.it/mailman/listinfo/settimanale

1 0

[Settimanale] Fw: Nicolai Krylov, "On the maximum principle for SPDEs..."
by Giulia Curciarello 14 Jun '06

14 Jun '06

> CENTRO DI RICERCA MATEMATICA ENNIO DE GIORGI > > Nell'ambito del semestre su "Analisi Stocastica" in corso di svolgimento > presso il Centro De Giorgi, il Prof. NICOLAI KRYLOV (University of > Minnesota) terra' due lezioni su: > > "On the maximum principle for SPDEs, the continuity of their solutions, > and the law of square root for Brownian motion" > > ABSTRACT: > The maximum principle for SPDEs is established in multidimensional > $C^{1}$ domains. An application is given to proving the Hoelder > continuity up to the boundary of solutions of one-dimensional SPDEs. A > new law of square root for Brownian motion, discovered in connection > with the continuity, plays a crucial role. > > Le lezioni si terranno in Sala Conferenze (Collegio Puteano, Piazza dei > Cavalieri 3 Pisa) secondo il seguente calendario: > > Mercoledi' 21 Giugno, 10.30-12.30 > Giovedi' 22 Giugno, 10.30-12.30 > > Tutti gli interessati sono invitati a partecipare. _______________________________________________ Settimanale mailing list Settimanale(a)mail.dm.unipi.it https://mail.dm.unipi.it/mailman/listinfo/settimanale

1 0

[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

1 0

[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

1 0