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Recent Submissions

Now showing 1 - 5 of 11
  • Publication
    Rendiconti dell’Istituto di matematica dell’Università di Trieste. An International Journal of Mathematics. Vol. 50 (2018)
    (EUT Edizioni Università di Trieste, 2018)
    Università degli Studi di Trieste, Dipartimento di Matematica e Informatica
    Rendiconti dell’Istituto di Matematica dell’Università di Trieste was founded in 1969 by Arno Predonzan, with the aim of publishing original research articles in all fields of mathematics and has been the first Italian mathematical journal to be published also on-line. The access to the electronic version of the journal is free. All published articles are available on-line. The journal can be obtained by subscription, or by reciprocity with other similar journals. Currently more than 100 exchange agreements with mathematics departments and institutes around the world have been entered in.
      182  688
  • Publication
    A note on finite group-actions on surfaces containing a hyperelliptic involution
    (EUT Edizioni Università di Trieste, 2018)
    Zimmermann, Bruno P.
    By topological methods using the language of orbifolds, we give a short and efficient classification of the finite diffeomorphism groups of closed orientable surfaces of genus g >= 2 which contain a hyperelliptic involution; in particular, for each g >= 2 we determine the maximal possible order of such a group.
      277  91
  • Publication
    Some additive decompositions of semisimple matrices
    (EUT Edizioni Università di Trieste, 2018)
    Dolcetti, Alberto
    ;
    Pertici, Donato
    Under suitable hypotheses on the ground eld and on the semisimple matrix M, we discuss some additive decompositions of M and of its image through a convergent power series.
      352  78
  • Publication
    Tannakian categories, fundamental groups and Higgs bundles
    (EUT Edizioni Università di Trieste, 2018)
    Bruzzo, Ugo
    After recalling the basic notions concerning pro nite and proalgebraic group completions and Tannakian categories, we review how the latter can be used to de ne generalizations of the notion of fundamental group of a space, such as the Nori and Langer fundamental groups, and the algebraic fundamental group introduced by Simpson. Then we discuss how one can de ne a Tannakian category whose objects are Higgs bundles on a complex projective variety that are \numerically at" in a suitable sense, and show how the Higgs fundamental group is related to a conjecture about semistable Higgs bundles.
      365  332
  • Publication
    On Fröberg-Macaulay conjectures for algebras
    (EUT Edizioni Università di Trieste, 2018)
    Boij, Mats
    ;
    Conca, Aldo
    Macaulay's theorem and Fr oberg's conjecture deal with the Hilbert function of homogeneous ideals in polynomial rings over a eld K. In this short note we present some questions related to variants of Macaulay's theorem and Fr oberg's conjecture for K-subalgebras of polynomial rings.
      277  123