Aktuelles
13. November 2025
Verteidigung der Promotion von Herrn Davide Manfredo
"Modelling and simulation of constitutive inelastic effects in composite cables by means of Prandl-Ishlinskii operators"
Beginn: 16.15 Uhr
Ort: Hörsaal 1.04, Von-Seckendorff-Platz 1
07.11.2025
Die Promotionsverteidigung von Frau Nahid Jamshidi (Institut für Mathematik) findet am 07.11.2025, 13.00 Uhr, im Hörsaal 1.23, Von-Seckendorff-Platz 1 statt.
Thema: Model Order Reduction for Stochastic Differential Equations driven by Standard and Fractional Brownian motion
28. Oktober 2025
Kolloquium
Vortragender: Prof. Colm Mulcahy (Professor Emeritus, Spelman College, Atlanta, USA; Adjunct Professor, SETU Waterford, Ireland)
"Mathemagic with a Deck of Cards"
Beginn: 16:15
Ort: Raum 3.07, VSP 1
Abstract: We survey new and old principles in mathemagic and their application to card tricks. These provide an entertaining and often surprising forum for mathematics which can be used (1) to generate student interest in the subject, and (2) as a jumping off point for undergraduate independent study and research. Predictions, mindreading, unaddition, and more! Learn new tricks to entertain family and friends.
30.07.2025
Am 30.07.2025, 10.00 Uhr, findet im HS 1.04, Von-Seckendorff-Platz 1, die Promotionsverteidigung von Frau Melanie Möckel zum Thema „Bifurkation für ein stark indefinites elliptisches System partieller Differentialgleichungen mittels klassischem und äquivariantem Spektralfluss" statt.
03. Juli 2025
Kolloquium
Vortragender: Dr. Stephan Mescher (Universität Halle)
"On topological and geodesic complexities of manifolds“
Beginn: 16:15 Uhr
Ort: HS 1.04, VSP 1
Abstract:
In this talk, I want to outline the contents of my habilitation proposal to the institute, which I would to submit to the faculty in the near future. I will give an overview of my research projects from the previous years. Topological complexity (TC), as introduced by M. Farber in 2003, is an integer-valued homotopy invariant of topological spaces that is motivated by the motion planning problem from robotics. After a short introduction to topological complexity (TC), I will first present lower bounds on topological complexities of closed manifolds. As consequences of these bounds, we obtain a characterization of manifolds dominated by products in terms of TC as well as a computation of the TC of certain symplectic manifolds. I will also discuss the TC of frame bundles and explain how it can be seen as an abstraction of oriented motion planning. Afterwards, I will talk about geodesic complexity, an abstraction of motion planning along paths of minimal length. Several results on the geodesic complexity of homogeneous Riemannian manifolds, obtained by M. Stegemeyer and myself, will be discussed.
Moreover, I will present spherical complexities, which are invariants for loop and sphere spaces that resemble topological complexity and which can be used to obtain topological lower bounds for the number of critical orbits of functionals on loop and sphere spaces which are invariant under orthogonal reparametrizations. I will also show how to apply such a bound to derive several new existence results for closed geodesics in spheres and projective spaces under curvature pinching conditions. If time permits, I may also speak about results on algebraic characterizations of the TC of aspherical spaces in terms of their fundamental groups.