Quadratic Forms and Real Algebra
Dortmund, 26-27 October 2023
Conference on the occasion of Eberhard Becker's 80th birthday
Speakers
- Ludwig Bröcker (Münster)
- Jean-Louis Colliot-Thélène (Paris)
- Françoise Delon (Paris)
- Patrick Felke (Emden-Leer)
- Manfred Knebusch (Regensburg)
- Wojciech Kucharz (Kraków)
- Franz-Viktor Kuhlmann (Szczecin)
- Marie-Françoise Roy (Rennes)
- Rudolf Scharlau (Dortmund)
- Claus Scheiderer (Konstanz)
- Konrad Schmüdgen (Leipzig)
Organizers
Karim Johannes BecherDetlev Hoffmann
Daniel Plaumann
Programme
Thursday, 26 October| 9:30 | Welcome | |
| 10:00-10:45 | R. Scharlau: Biographical Notes | |
| - Coffee break - | ||
| 11:15-12:00 | M. Knebusch: Quadratic Forms on Modules over Semirings : New Ways (Abstract / Link to paper) | |
| - Lunch - | ||
| 13:15-14:00 | L. Bröcker: All the Way with Pythagoras (Slides) | |
| 14:00-14:45 | F. Delon: Sums of 2n-th Powers and Orderings of Higher Level | |
| - Coffee break - | ||
| 15:15-16:00 | P. Felke: Post-Quantum Cryptography (Abstract / Slides) | |
| from 18:30 | Conference dinner |
Friday, 27 October
| 9:30-10:15 | J.-L. Colliot-Thélène: Rationalitätsfragen bei Familien von reellen Quadriken (Zusammenfassung) | |
| - Coffee break - | ||
| 10:45-11:30 | C. Scheiderer: Sums of squares in polynomial optimization (Abstract) | |
| 11:45-12:30 | K. Schmüdgen: Positivstellensätze for semirings (Abstract / Slides) | |
| - Lunch - | ||
| 13:45-14:30 | F.-V. Kuhlmann: Density of various subsets in spaces of places of function fields, and applications to real holomorphy rings (Abstract / Slides) | |
| 14:45-15:30 | W. Kucharz: Approximation and homotopy in real algebraic geometry (Abstract) | |
| - Coffee break - | ||
| 16:00-16:45 | M.-F. Roy: Elementary recursive degree bounds for Hilbert’s 17th problem and Positivstellensatz (Abstract / Slides) |
Saturday, 28 October
City tour with Eberhard, (approx. 10am-1pm, followed by lunch)
Group photo
(Most, but unfortunately not all, participants and organizers...)
