In the 1950’s Davenport, Mirsky, Newman and Rado proved that if the integers are partitioned by…
Seminars
Future and Ongoing Seminars
FC1 007 and Online |
Algebra, Combinatorics and Number Theory
Speaker: Martino Garonzi
FC1 007 and Online |
Algebra, Combinatorics and Number Theory
The Gruenberg-Kegel graph of a group is defined as the graph whose vertices are the primes that…
Speaker: Diego Lucas Garcia
FC1 007 and Online |
Algebra, Combinatorics and Number Theory
Chen, Erdős, and Staton asked in 1996 how many edges are required in an n-vertex graph to…
Speaker: António Girão
FC1 031 and online |
Algebra, Combinatorics and Number Theory
This has been an open question for more than 70 years. I'll review what is known, including some…
Speaker: Ken Brown
FC1 031 and online |
Algebra, Combinatorics and Number Theory
Quasi-hereditary algebras are a class of finite-dimensional associative algebras that appear…
Speaker: Tiago Cruz
FC1 031 and online |
Algebra, Combinatorics and Number Theory
Quasigroupoids and weak Hopf quasigroups are non-associative generalizations of groupoids and…
Speaker: Ramón González Rodríguez
FC1 031 and online |
Algebra, Combinatorics and Number Theory
Polynomial expansion concerns the heuristic expectation that, for a typical polynomial P in n…
Speaker: Nuno Arala Santos
Past Seminars
Room FC1 030, DMat-FCUP |
Semigroups, Automata and Languages
We study a class of morphisms between two-sided restriction semigroups which we call {\it proper…
Speaker: Mykola Khrypchenko
Room 1.09 |
Geometry and Topology
During the first half of the talk I will give a survey about the Hitchin connection on the sheaf…
Speaker: Christian Pauly
Room 0.31 |
Geometry and Topology
There exists a unique (smooth) cubic hypersurface of dimension 7 in $\mathbb{P}^8$ which is…
Speaker: Xavier Roulleau
Room 0.31 |
Geometry and Topology
A classical result due to Seidenberg states that every singular holomorphic foliation on a…
Speaker: Helena Reis
FCUP, Dep. Matemática, anfiteatro FC1 030 |
Analysis
The problem of solving Fredholm integral equations of the first kind is a prototype of an ill-…
Speaker: Laurence Grammont
FCUP, Dep. Matemática, anfiteatro FC1 030 |
Analysis
We consider approximate solutions of the following Fredholm integral equation $$x (s) - \int_0^…
Speaker: Rekha P. Kulkarni
Room 1.09 |
Geometry and Topology
This is joint work with C. Florentino. The theory of motifs is an attempt to establish a…
Speaker: Jaime Silva
Room 1.09 |
Geometry and Topology
There is already a generalized description of classes of moduli spaces of geometric structures…
Speaker: Ronald Zúñiga-Rojas
Room 1.09 |
Geometry and Topology
Mirror symmetry is a prediction arising from theoretical physics which roughly conjectures that…
Speaker: André Oliveira
Room 1.09 |
Geometry and Topology
Following the work of Miranda for triple covers, given a covering map $f\colon X\rightarrow Y$,…
Speaker: Eduardo Dias
Room FC1 030, DMat-FCUP |
Semigroups, Automata and Languages
The Prouhet-Thue-Morse sequence is obtained by starting with the letter a and successively…
Speaker: Jorge Almeida
Room 1.09 |
Geometry and Topology
A group $G$ is Jordan if there exists a constant $C$ such that
any finite subgroup of $G$…
Speaker: Ignasi Mundet i Riera
Room FC1 030, DMat-FCUP |
Semigroups, Automata and Languages
In a paper of 1993, Pin and Thérien establish an algebraic characterization of the closure…
Speaker: Ana Escada
Room 1.09 |
Geometry and Topology
A generalised Kummer surface $X=Km(T,G)$ is the minimal resolution of the quotient $T/G$ of a…
Speaker: Xavier Roulleau
Room 1.09 |
Geometry and Topology
The Bethe Ansatz equations were initially conceived as a
method to solve some particular…
Speaker: Davide Masoero
Room 1.09 |
Geometry and Topology
I’ll explain how the absolute Galois group of the rationals acts on …
Speaker: Pedro Boavida de Brito
Room FC1 030, DMat-FCUP |
Semigroups, Automata and Languages
We will uncover in this talk deep and surprising connections between the theories of…
Speaker: Pedro V. Silva
Room 1.09 |
Geometry and Topology
In this talk we will discuss a construction of scalar-flat Kähler toric metrics on non-compact 4…
Speaker: Rosa Sena-Dias
Room 1.09 |
Geometry and Topology
We explain the construction of an explicit regulator map at the level of complexes:…
Speaker: Pedro Ferreira dos Santos
Room FC1 030, DMat-FCUP |
Semigroups, Automata and Languages
A code is a set of words that freely generates a free submonoid of the free monoid. A specially…
Speaker: Alfredo Costa