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...

2024-06-04

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

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...

2024-06-04

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

We start by presenting a brief overview of the various known lattice representations. From there we introduce some results of our work on TiRS graphs which abstract the lattice duals in Ploscica's representation (1995) via maximal partial maps into the two-element set. Those particular...

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...

2024-09-24

Speaker: Barry Simon (Caltech, USA)

© document.write(new Date().getFullYear()) Centre for Mathematics, University of Coimbra, funded by

Powered by: rdOnWeb v1.4 | technical support

Powered by: rdOnWeb v1.4 | technical support