Oberseminar Algebra, Zahlentheorie und Diskrete Mathematik
Sommersemester 2025
Donnerstags, 14:15-15:15 Uhr
Seminarraum A410 im Welfenschloss (Hauptgebäude, Welfengarten 1)
Datum | Vortragende/r | Vortragstitel |
---|---|---|
Do 10.4.2025 | Vorbesprechung | |
Do 8.5.2025 | Nils Wirries (LUH) | Plesken Lie algebras of associative algebras with involution |
Do 15.5.2025, 13:50 | Loïs Faisant (IST Austria)
| Counting rational curves with prescribed tangency conditions: a motivic analogue via universal torsors Abstract: Given a smooth projective and geometrically irreducible curve C and a Mori Dream Space X, we present a general parametrisation of morphisms from C to X which allows us to express the Grothendieck motive of Hom (C,X) as a motivic function defined on some power of the scheme of effective divisors of C, generalising previous works of Bourqui. Such a parametrisation should be understood as lifting our morphisms to the universal torsor of X. |
Do 15.5.2025, 15:10 | Victor Wang (IST Austria) | Average sizes of mixed character sums Abstract: In joint work with Max Xu, we prove that the average size of a certain smoothly weighted, mixed character sum of length x is on the order of sqrt(x), under a weak Diophantine genericity condition on the angle θ of the additive character e(nθ). Certain quadratic Diophantine equations play a key role. In contrast, it was proved by Harper that the average size is o(sqrt(x)) for rational θ. Some remaining open questions will be highlighted. |
Mo 19.5.2025 in Göttingen | 15:00 Maxim Gerspach (Göttingen) 16:30 Gunther Cornelissen (Utrecht) | Göttingen-Hannover Number Theory Workshop |
Do 22.5.2025 | Johannes Schmitt (Bochum) | |
Do 5.6.2025 | ||
Do 19.6.2025 | ||
Do 26.6.2025 | ||
Do 3.7.2025 | Efthymios Sofos (Glasgow) | |
Do 10.7.2025 | ||
Mi 16.7.2025, 14:15 in G117 | Marta Pieropan (Utrecht) |