Seminars



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Lie groupoids: between equivariant and non-commutative geometry
2024-02-28
Speaker: Bjarne Kosmeijer (Univ. Amsterdam, Netherlands)
Lie groupoids are important objects in the study of symmetries, because they encode a broader notion of symmetries than just actions of Lie groups. It is important, for instance in the context of index theory, to understand the equivariant geometric aspects of a Lie groupoid. For Lie...

Supercharacters: behind and beyond
2024-02-28
Speaker: Carlos André (CMUC & Univ. Lisboa)
Describing the conjugacy classes or irreducible characters of the unipotent upper triangular group over a finite field is known to be an impossibly difficult problem. Superclasses and  supercharacters have been introduced (under the names of "basic varieties" and "basic characters") as...

TBA
2024-03-13
Speaker: Gonçalo Varejão (CMUC, UC|UP PhD student)
TBA...

TBA
2024-04-24
Speaker: Aram Diaw (CMUP, Univ. Porto)
TBA...

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