Centre for Mathematics, University of Coimbra

Seminars

Delsarte's extremal problem and packing on locally compact Abelian groups

2024-05-21

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

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

Structure of quasi-crystal graphs and applications to the combinatorics of quasi-symmetric functions

2024-05-29

Speaker: Inês Rodrigues (Univ. Nova de Lisboa)

Crystal graphs are powerful combinatorial tools for working with the plactic monoid and symmetric functions. Quasi-crystal graphs are an analogous concept for the hypoplactic monoid and quasi-symmetric functions.We explicitly describe a previously observed isomorphism of components of the...

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...

i-Fitting-Formations on Clifford semigroups

2024-06-04

Speaker: Ana Catarina Monteiro (CEMAT, Univ. Lisboa)

In this talk, we will explore the concept of i-Fitting-Formation of Clifford semigroups. A Clifford semigroup is an inverse semigroup that is a union of groups. A class of Clifford semigroups is an i-formation if it is closed for idempotent separating quotients and for finitary...

TBA

2024-06-04

Speaker: Maria João Gouveia (CEMAT, Univ. Lisboa)

TBA...

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...