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Seminars

**Discrete harmonic analysis related to classical orthogonal polynomials**
2024-04-23

Speaker: Alberto Arenas (University of La Rioja, Spain)

https://www.mat.uc.pt/~pgsfop/events.html...

**On \(C^2\)-actions on complex surfaces**
2024-04-24

Speaker: Aram Diaw (CMUP, Univ. Porto)

Given a complex surface \( S \), we are interested in the description of an \( C^2 \)- action on \( S \). It is well-known that this kind of action can be seen as the group of transformations given by the global flows of a pair of commuting complete vector fields. Our goal is to...

**Torsionfree representations of Smith algebras **
2024-04-24

Speaker: Samuel Lopes (CMUP, Univ. Porto)

We will discuss representations of the Smith algebra which are free of finite rank over a subalgebra which plays a role analogous to that of the (enveloping algebra of the) Cartan subalgebra of the simple Lie algebra \( \mathfrak{sl}_2 \). In the case of rank 1, we obtain a full description...

**"Classical" orthogonal polynomials of more than one variable**
2024-04-25

Speaker: Yuan Xu (Univ. of Oregon, USA)

www.mat.uc.pt/~pgsfop/activities.html...

**An approach to the solvability of a fractional differential problem**
2024-05-07

Speaker: Anabela Silva (Univ. Aveiro)

https://www.mat.uc.pt/~pgsfop/events.html...

**TBA**
2024-05-21

Speaker: Elena Berdysheva (Univ. Cape Town, South Africa)

https://www.mat.uc.pt/~pgsfop/activities.html...

**Homomorphisms on holomorphic functions in infinite dimensions**
2024-06-04

Speaker: Richard M. Aron (Kent State Univ., USA)

https://www.mat.uc.pt/~pgsfop/activities.html...

**On chain polynomials of posets **
2024-06-26

Speaker: Leonardo Saud Maia Leite (KTH Royal Institute of Technology, Sweden)

The chain polynomial of a finite lattice \( \mathcal{L} \) is given by \( p_\mathcal{L} (x) = \sum_{k \geq 0} c_k(\mathcal{L})x^k \), where \( c_k(\mathcal{L}) \) is the number of chains of length \( k \) in \( \mathcal{L} \). The chain polynomials of posets in several important classes have...

**Gap labelling for periodic Jacobi matrices on trees**
2024-09-24

Speaker: Barry Simon (Caltech, USA)

https://www.mat.uc.pt/~pgsfop/activities.html...

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