Seminare und Vorträge im WS 2025/2026
| Date | Lecturer | Seminar | Theme | Time | Location |
|---|---|---|---|---|---|
| 30 Sep 2026 | Bernhard Keller (Université Paris Cité, France) | Report on Kong–Liu–Shen's disproof of Han's conjecture Abstract. In 2006, Yang Han conjectured that a finite-dimensional algebra has finite global dimension if its Hochschild homology vanishes in all sufficiently high degrees. The analogous statement for finitely generated commutative algebras follows from work of BACH and of Avramov–Vigué-Poirier. The conjecture itself was shown to hold for many classes of algebras by several authors including Bergh, Cibils, Erdmann, Lanzilotta, Marcos, Redondo, Solotar, Suárez-Álvarez, Vivas, Ren Wang, Xiaoxiao Xu, Yunge Xu, Jinbi Zhang, and Guodong Zhou. In late August 2026, Bochao Kong, Yeqin Liu and Yu Shen posted a preprint where they construct a counter-example starting from Krah's universal phantom on the blow-up of the projective plane in 10 general points. We will sketch their construction, focusing on the passage from a proper dg algebra to a finite-dimensional algebra concentrated in degree zero. | Wednesday 2-3pm Time Zone Berlin, Rome, Paris | online https://sites.google.com/view/lagoonwebinar/home |
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| 13 Oct 2026 | Johanne Haugland (NTNU) | A geometric model for the module category of a special biserial algebra Abstract: In recent years, geometric models have emerged as an important tool in the study of the representation theory of algebras, and such models have highlighted important connections to other areas of mathematics. A geometric model for the module category of a gentle algebra, and more generally of a string algebra, has been developed by Baur and Coelho Simões. In this talk, we use this as a starting point for constructing a geometric model for the module category of a special biserial algebra. The talk is based on joint work in progress with Azzurra Ciliberti, Raquel Coelho Simões and Martin Herschend. | Tuesday, 2:30pm Time Zone Berlin, Rome, Paris | in person Stefan-Cohn-Vossen Raum 313, 3rd floor |
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| 20 Oct 2026 | Lior Silberberg (IMJ-JRP) | tba | Tuesday, 2:30pm Time Zone Berlin, Rome, Paris | in person Stefan-Cohn-Vossen Raum 313, 3rd floor |
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| 27 Oct 2026 | Robert Szafarczyk (Københavns Universitet) | tba | |||
| 28 Oct 2026 | Zhengfang Wang (University of Nanjing, China) | tba |