The seminar takes place every Thursday from 1pm to 2pm in room B217 of the science building.
17.9.2026
DongSeon Hwang (IBS Center for Complex Geometry, Daejeon, South Korea)
Cascades of klt del Pezzo surfaces of Picard number one
There have been numerous attempts to classify log del Pezzo surfaces. In this talk, I will quickly summarize these developments and present my work on the classification of klt del Pezzo surfaces of Picard number one. The result is obtained by generalizing the notion of ‘cascades’ of nonsingular del Pezzo surfaces, following the approach initiated by Miyanishi and Zhang.
24.9.2026
Allen Knutson (Cornell University, Ithaca, New York, USA)
The mathematics of juggling, old and new
I’ll explain how to associate a juggling pattern to a matrix (and in the process,
give a mathematical definition of juggling pattern, familiar to jugglers since
the mid-’80s). This defines the “positroid” stratification of the space of k x n matrices,
with many great geometric features (e.g. the strata are smooth and their
closures are normal). Much of this has been understood since 2013 down
on the Grassmannian (matrices up to row operations) but there are new
features when working upstairs on matrices. The 2013 work is joint with
Thomas Lam and David Speyer, the new with Paul Zinn-Justin.
1.10.2026
Anastasia Vikulova (Universität Basel, Switzerland)
Composition of Sarkisov links between del Pezzo surfaces
In this talk we show that for any two birationally equivalent minimal del Pezzo surfaces there is a birational map between them which is a composition of at most two Sarkisov links.
8.10.2026
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15.10.2026
Masafumi Hattori(University of Kyoto, Japan)
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22.10.2026
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(Jérémy away)
29.10.2026
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5.11.2026
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(Jérémy away)
9.11.2026 (MONDAY)
Francesco Gallinaro (Scuola Normale Superiore, Pisa, Italy)
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12-13.11.2026
BENDZ Seminar of algebraic geometry in Basel
19.11.2026
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26.11.2026
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3.12.2026
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10.12.2026
Valentin Huguin(Université de Picardie Jules Verne, Amiens)
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17.12.2026
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