Por Jean-Éric Pin (Institut de Recherche en Informatique Fondamentale, CNRS et University Paris-Diderot).

Abstract: Difference hierarchies were originally introduced by Hausdorff and they play an important role in descriptive set theory. In this lecture, I will review standard techniques on difference hierarchies, mostly due to Hausdorff. These techniques will be illustrated by some decidability results on difference hierarchies based on shuffle ideals and polynomials of group languages.

Workshop associado à Conferência "All Kinds of Mathematics Remind me of You".

Robert Gray
University of East Anglia

Gathering excellence where Cameron excels: Combinatorics, Groups, Model Theory, Number Theory, Semigroups, Statistics, and more...

Miguel Couceiro
LORIA (CNRS - Inria Nancy Grand Est - Universite de Lorraine)

Apresentação de Bernardo Fernandes.

Apresentação de Luís Sampaio.

A Munn tree type representation for the bifree locally inverse semigroup
Luís Oliveira (CMUP)

António Malheiro
DM & CMA/FCT/UNL

On the decidability of conjugacy for homogeneous monoids