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Seminari Topologia Geometrica

  • venerdì 25/11/22, aula M1.6 - on line: https://meet.google.com/sdx-bykx-nep
    • ore 15: Bruno Martelli (Università di Pisa), Shadows of 3- and 4-manifolds I
      Abstract: A shadow is a two-dimensional cell complex designed to be thickened in 4 dimensions. This object, introduced by Turaev, communicates nicely with three facets of geometric topology that are quite distant from each other: that of smooth 4-manifolds, hyperbolic 3-manifolds, and quantum invariants. We will introduce shadows and focus mostly on the first two aspects, that is their relation with 4-manifolds and hyperbolic 3-manifolds.
    • ore 16.30: Josè Marìa Montesinos Amilibia (Real Academia de Ciencias Exactas, Físicas y Naturales, Spagna), Integral quadratic forms: commensurability and projective equivalence
      Abstract: Two integral quadratic forms are said to be commensurable if so are they groups of automorphs. And they are projectively equivalent if rational multiples of both are rationally equivalent. We will show the equivalence of these concepts when the forms are indefinite.
  • venerdì 2/12/22, ore 16.30 - on line: https://meet.google.com/kmz-bnop-cuk

    Josè Marìa Montesinos Amilibia (Real Academia de Ciencias Exactas, Físicas y Naturales, Spagna), Integral quadratic forms: invariants for projective equivalence
    Abstract: Two integral quadratic forms are projectively equivalent if and only if a finite set of invariants, readily computable, coincide. The odd and even dimensional cases are strikingly different. The invariants are related to the so-called Conway excesses invariants of rational equivalence.
  • mercoledì 14/12/22 - on line: https://meet.google.com/xqc-udeq-vwf
    • ore 15: Daniele Zuddas (Università di Trieste), titolo da definirsi
    • ore 16.30: Bruno Martelli (Università di Pisa), Shadows of 3- and 4-manifolds II


Host:
Paola Cristofori (FIM) paola.cristofori@unimore.it
Maria Rita Casali (FIM) casali@unimore.it

[Ultimo aggiornamento: 02/12/2022 09:25:28]