ingleseENG
Direttore Vicario: Prof. Gabriele Grillo
Responsabile Gestionale: Dr.ssa Franca Di Censo

 Seminari

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Prossimi Seminari

  • Working with compositional data in coordinates
    Eva Fiserova, Palacky University Olomouc, Czech Republic
    mercoledì 21 novembre 2018 alle ore 14:30, aula Saleri VI piano
  • Illuminazione, visione e opere d’arte: il punto di vista del fisico
    Farini Alessandro, Istituto Nazionale di Ottica, CNR, Firenze
    mercoledì 21 novembre 2018 alle ore 15:00, Sala Consiglio VII piano
  • An overview of some mathematical and computational problems in Network Science
    Michele Benzi, Scuola Normale Superiore, Pisa
    giovedì 22 novembre 2018 alle ore 14:00,  Aula Consiglio VII Piano – Edificio 14, Dipartimento di Matematica POLITECNICO DI MILANO
  • BIRATIONAL EQUIVALENCE OF ALGEBRAIC VARIETIES
    Shigefumi Mori, Kyoto University Institute of Advanced Study
    lunedì 26 novembre 2018 alle ore 16:30, Aula Chisini, Diparimento di Matematica, Via C. Saldini 50
  • The Quantitative Alexandrov Theorem in Space forms
    Luigi Vezzoni, Università degli Studi di Torino
    martedì 27 novembre 2018 alle ore 15:15, Aula seminari 3° piano
  • First Principles Determination of Reaction Rates
    Carlo Cavallotti, Dipartimento di Chimica, Materiali e Ingegneria Chimica, “G. Natta”, Politecnico di Milano
    martedì 27 novembre 2018 alle ore 10:30, aula Saleri VI piano
  • Emodinamica della circolazione epatica: problemi e nuove acquisizioni
    Massimiliano Tuveri, Azienda Ospedaliera Universitaria Integrata, Verona, Italy
    giovedì 29 novembre 2018 alle ore 11:30, aula consiglio VII piano
  • Characterization of Attraction Domains for Generic Quantum Semigroups
    Damiano Poletti, Politecnico di Milano
    giovedì 29 novembre 2018 alle ore 14:30 precise, Aula Seminari III piano

Seminari Passati

  • Maximally writhed real algebraic knots and links
    Grigory Mikhalkin, Université de Genève
    giovedì 17 maggio 2018 alle ore 17:00 precise, Sala di Rappresentanza, Università di Milano, Via C. Saldini 50, Milano
    ABSTRACT
    The Alexander-Briggs tabulation of knots in R^3 (started almost
    a century ago, and considered as one of the most traditional ones
    in classical Knot Theory) is based on the minimal number of crossings
    for a knot diagram. From the point of view of Real Algebraic Geometry
    it is more natural to consider knots in RP^3 rather than R^3, and use
    a different number also serving as a measure of complexity of a knot:
    the minimal degree of a real algebraic curve representing this knot.

    As it was noticed by Oleg Viro about 20 years ago, the writhe of a knot
    diagram becomes an invariant of a knot in the real algebraic set-up,
    and corresponds to a Vassiliev invariant of degree 1. In the talk we’ll
    survey these notions, and consider the knots with the maximal possible
    writhe for its degree. Surprisingly, it turns out that there is a unique
    maximally writhed knot in RP^3 for every degree d. Furthermore, this
    real algebraic knot type has a number of characteristic properties, from
    the minimal number of diagram crossing points (equal to d(d-3)/2) to
    the minimal number of transverse intersections with a plane (equal to
    d-2). Based on a series of joint works with Stepan Orevkov.
  • Modellazione paziente specifica in emodialisi
    Maria Laura Costantino, Politecnico di Milano
    mercoledì 16 maggio 2018 alle ore 12:15, Politecnico di Milano Campus Bonardi Edificio14 aula B21
  • Evolution by curvature of networks in the plane
    Carlo Mantegazza, Università degli Studi di Napoli Federico II
    mercoledì 16 maggio 2018 alle ore 15:15, Aula seminari piano 3
    ABSTRACT
    We will present the state-of-the-art of the problem of the motion by curvature of a network of curves in the plane, discussing existence, uniqueness, singularity formation and asymptotic behavior of the flow.
  • Numerical Wiener-Hopf factorization method for option pricing under Lévy models
    Oleg Kudryavtsev, Rostov Branch of Russian Customs Academy
    martedì 15 maggio 2018 alle ore 12:15 precise, Aula Seminari Terzo Piano
  • Recent progress on rationality problems
    Arnaud Beauville, Université de Nice
    lunedì 14 maggio 2018 alle ore 15:30, Sala di Rappresentanza, Università di Milano, Via C. Saldini 50, Milano
    ABSTRACT
    We say that an algebraic variety is unirational if it can be parametrized by rational functions, rational if moreover the parametrization can be chosen to be one-to-one. A very classical problem, called nowadays the Luroth problem, asks whether a unirational variety is necessarily rational. This holds for curves (Luroth, 1875) and for surfaces (Castelnuovo, 1894); after various unsuccessful attempts, it was shown in 1971 that the answer is quite negative in dimension 3: there are many examples of unirational varieties which are not rational. Up to 3 years ago the known examples in dimension >3 were quite particular, but a new idea of Claire Voisin has significantly improved the situation. I will survey the colorful history of the problem, then explain Voisin’s idea, and how it leads to a number of new results.
  • Preconditioning and stabilization of poromechanics problem with CutFem approximation
    Daniele Cerroni, MOX- Politecnico di Milano
    venerdì 11 maggio 2018 alle ore 11:30, Aula Seminari ‘Saleri’ VI Piano MOX-Dipartimento di Matematica, Politecnico di Milano – Edificio 14
    ABSTRACT
    We investigate the conditioning of a computational model for poroelasticity in the case of a moving domain boundary. We approximate the problem by means of a numerical scheme which does not require that the computational mesh conforms with the moving boundary (CutFem approximation) and, we use a Nitsche’s method to apply boundary condition onto this region. The ill conditioning driven by the approximation with CutFem is combined with the naturally ill conditioning due to the saddle point nature of the poroelastic problem. The latter problem can be addressed with a splitting iterative scheme that decouple the solution of the mechanics problem from the solution of the pressure equation.
    In this work we investigate the conditioning of the two sub-problems in the case of tiny intersection produced by the CutFem approximation. In particular we explore the possibility of adding a stabilization term into the pressure equation and use a propoer preconditioner for the displacement equation.

    Contact: paolo.zunino@polimi.it
  • Development of a HPC library for the parallel implementation of p-adaptive discontinuous finite element methods applied to geophysical flows.
    Stella Paronuzzi Ticco, OGS Trieste and Laboratorio MOX Milano
    giovedì 10 maggio 2018 alle ore 10:30, Aula Seminari ‘Saleri’ VI Piano MOX-Dipartimento di Matematica, Politecnico di Milano – Edificio 14
    ABSTRACT
    Discontinuous finite element methods have been gaining in popularity for large scale geophysical applications. They are also a natural environment to take advantage of adaptive approaches in which the degree of the approximating polynomials is chosen locally and dynamically, in order to minimize memory occupation and computational cost. However, this poses major challenges to the parallel efficiency of the resulting methods, since a greater effort to achieve optimal load balancing is required. At present, no general HPC infrastructure for efficient and natively adaptive implementation of DG methods on massively parallel is available.The purpose of this joint research with G. Tumolo of ICTP Trieste is to move towards the development of such a tool especially tailored for the simulation of fluid dynamics problems in climate dynamics, oceanography and volcanology.

    contact: luca.bonaventura@polimi.it
  • Computer, simulazioni ed esperimenti: all’alba di un nuovo metodo sperimentale?
    Viola Schiaffonati, Politecnico di Milano
    mercoledì 9 maggio 2018 alle ore 12:15, Politecnico di Milano Campus Bonardi Edificio14 aula B21