Aktuelle Vorträge und Veranstaltungen

Wintersemester 2017/18

Do., 30. November 2017 Oberseminar Algebra und Geometrie
Zeit und Ort: 14:15-15:15 Uhr in Raum 711 (groß), Robert-Mayerstr. 10

  • Katharina Hübner (Universität Heidelberg): The tame site

    Let X be a scheme over a field of characteristic p> 0. The étale cohomology groups of X with p-torsion coefficients are not very well behaved. For instance, the group H1(A1k,et,Z/pZ) vanishes if k has characteristic different from p, but it is not even finitely generated if the characteristic of k is p. We propose a definition of a "tame site" which does not have these problems and whose fundamental group is the tame fundamental group which is already known.

Do, 7. Dezember 2017 Darmstadt-Frankfurt Forschungsseminar [Programm]

Zeit und Ort: 15:00 Uhr in Raum 711 (groß), Robert-Mayerstr. 10

  • Jonathan Zachhuber: Grothendieck’s Sheaf-Function Correspondence
  • Matthias Nickel: Proof of the Main Theorem of Unramified Geometric CFT II

Mi, 13. Dezember 2017 - Kolloquium Frankfurter Seminar

  • Camillo de Lellis (Universität Zürich)

Do, 14. Dezember 2017 Oberseminar Algebra und Geometrie
Zeit und Ort: 14:15-15:15 Uhr in Raum 711 (groß), Robert-Mayerstr. 10

  • Anastasia Karathanasis: P-adische Potenzreihen.
    (Abschlussvortrag Bachelor)

Mi, 24. Januar 2018 - Kolloquium Frankfurter Seminar

  • Barbara Wohlmuth (Technische Universität München)

Do, 25. Januar 2018 Darmstadt-Frankfurt Forschungsseminar [Programm]
Zeit und Ort: 15:00 Uhr in Raum 711 (groß), Robert-Mayerstr. 10

  • Martin Lüdtke: Proof of the Main Theorem of Tamely Ramified Geometric CFT I
  • Yingkun Li: Proof of the Main Theorem of Tamely Ramified Geometric CFT II

Mi, 31. Januar 2018 - Kolloquium Frankfurter Seminar

  • Günter M. Ziegler (Freie Universität Berlin)

Do, 08. Februar 2018 Oberseminar Algebra und Geometrie
Ort: in Raum 711 (groß), Robert-Mayerstr. 10

  • 14:15-15:15 Uhr: Marco Matulan, title tba
  • 15:45-16:45 Uhr: Madeline Brandt (University of California, Berkeley), Tropical Superelliptic Curves

    Given a smooth curve defined over a valued field, it is a difficult problem to compute the Berkovich skeleton of the curve. In theory, one can find a semistable model for the curve and then find the dual graph of the special fiber, and this will give the skeleton. In practice, these procedures are not algorithmic and finding the model can become difficult. It is known how to find the Berkovich skeleton of genus one and genus two curves; more recently, the hyperelliptic case has also been solved. In this talk, we present the solution for superelliptic curves y^n=f(x). This involves studying the covering from the curve to P^1, and recovering data about the Berkovich skeleton from the tropicalization of P^1 together with the marked ramification points. Throughout the talk we will study many examples in order to get a feel for the difficulties of this problem and how the procedure is carried out.


gehaltene Vorträge im WiSe 17/18:


Do, 2. November 2017 Darmstadt-Frankfurt Forschungsseminar [Programm]
Zeit und Ort: 15:00 Uhr in Raum 711 (groß), Robert-Mayerstr. 10

  • Michalis Neururer: The algebraic fundamental group II
  • Matteo Costantini: Representations of the fundamental group and l-adic local systems

Mi, 15. November 2017 - Kolloquium Frankfurter Seminar

  • Hendrik W. Lenstra (Universität Leiden): "Solving equations in orders"
  • Ginkgo-Seminar dazu von Martin Lüdtke: "Vektorräume mit Multiplikation"

Do., 16. November 2017 Oberseminar Algebra und Geometrie
Zeit und Ort: 14:15-15:15 Uhr in Raum 711 (groß), Robert-Mayerstr. 10

  • Yuichiro Hoshi (RIMS, Kyoto University): On torsion points on a curve with good reduction over an absolutely unramified base
    Robert Coleman made a conjecture concerning ramification of torsion points on curves over absolutely unramified complete discrete valuation rings. In this talk, after reviewing the conjecture, we discuss some results related to it.