Publications
Publicações

Publications

Free profinite locally idempotent and locally commutative semigroups

Journal of Pure and Applied Algebra | 2001
DOI

How modern mathematics came to Portugal

Mathematical Intelligencer | 2001

Non-radial null geodesics in spherical dust collapse

Classical and Quantum Gravity | 2001

B.C. Nolan

DOI

Ranks of submatrices and the off-diagonal indices of a square matrix

Linear Algebra and Its Applications | 2000

E. Marques De Sá

The number of Kronecker indices of square pencils of a special kind

Linear Algebra and Its Applications | 2000

E. Marques De Sá

On finitely based pseudovarieties of the forms V * D and V * D<inf>n</inf><sup>1</sup>

Journal of Pure and Applied Algebra | 2000

J. Almeida

A parabolic quasi-variational inequality arising in a superconductivity model

Annali della Scuola Normale Superiore di Pisa - Classe di Scienze | 2000

Kinetic formulation of linear stability for steady detonation waves

Rivista Matematica della Università di Parma | 2000

Reactive Euler equations of discrete models with reversible reactions

Continuum Mechanics and Thermodynamics | 2000

M. Pandolfi Bianchi

Suspension of Ganea fibrations and a Hopf invariant

Topology and its Applications | 2000

Covariance estimation of the limit process of the empirical process under association

Recent Advances in Applied and Theoretical Mathematics | 2000

P.E. Oliveira

Kernel - Type Estimation of Bivariate Distribution Function for associated Random Variables

New Trends in Probability and Statistics, Proceedings of the 6 Tartu Conference, VSP | 2000

Free profinite semigroups over some classes of semigroups locally in DG

International Journal of Algebra and Computation | 2000

Some variations on the notion of locally testable language

Symmetries and the Karlhede classification of type N vacuum solutions

Classical and Quantum Gravity | 2000

E.G.L.R. Vaz

DOI

Wiener-Hopf factorization for a group of exponentials of nilpotent matrices

Linear Algebra and Its Applications | 2000

M.C. Câmara

Density contrast indicators in cosmological dust models

Pramana - Journal of Physics | 2000

R. Tavakol

Initial data and spherical dust collapse

Physical Review D - Particles, Fields, Gravitation and Cosmology | 2000

R. Tavakol

P.S. Joshi

Revisiting the correspondence between cut elimination and normalisation

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | 2000
DOI

Wiener–Hopf factorization for a group of exponentials of nilpotent matrices

Linear Algebra and Its Applications | 2000
DOI

Pseudovariety joins involving script J sign-trivial semigroups

International Journal of Algebra and Computation | 1999

J. Almeida

M. Zeitoun

A parabolic variational inequality with non-constant gradient constraint

Curvilinear crosscuts of subdivision for a domain decomposition method in numerical conformal mapping

Journal of Computational and Applied Mathematics | 1999

N. Papamichael

N.S. Stylianopoulos

DOI

Sur le transfert de Becker et Gottlieb

Bulletin of the Belgian Mathematical Society - Simon Stevin | 1999

Permutability of proofs in intuitionistic sequent calculi

Theoretical Computer Science | 1999

R. Dyckhoff

DOI

Métodos para Inclusão de Raízes s Simples de uma Equação não linear

Existência de Capacidade Simpletica

Equidistribution of parabolic fixed points in the limit set of Kleinian groups

Ergodic Theory and Dynamical Systems | 1999

Parametric population representation of retinal location: Neuronal interaction dynamics in cat primary visual cortex

Journal of Neuroscience | 1999

D. Jancke

H.R. Dinse

A.C. Akhavan

M. Giese

A. Steinhage

G. Schöner

The distribution of neuronal population activation (DPA) as a tool to study interaction and integration in cortical representations

Journal of Neuroscience Methods | 1999

A. Bastian

D. Jancke

A. Riehle

G. Schöner

DOI

Free Profinite R-trivial, Locally Idempotent and Locally Commutative Semigroups

Semigroup Forum | 1999
DOI

The Monoid of orientation-preserving mappings on a chain

Semigroup Forum | 1999

P.M. Higgins

DOI

Evolution of the density contrast in inhomogeneous dust models

Classical and Quantum Gravity | 1999

R. Tavakol

DOI

On the number of invariant polynomials of the product of matrices with prescribed similarity classes

Linear Algebra Appl. | 1998

Three examples of join computations

Semigroup Forum | 1998

M. Zeitoun

Initial-boundary-value problem for the broadwell model of a gas mixture with bimolecular reaction

Mathematical Methods in the Applied Sciences | 1998

Cut-Elimination and a Permutation-Free Sequent Calculus for Intuit ionist ic Logic

Studia Logica | 1998

R.O.Y. Dyckhoff

DOI

Sequent calculi for the normal terms of the ¿¿- and ¿¿S-calculi.

Sequent calculi for the normal terms of the λΠ- and λΠΣ-calculi.

Electron. Notes Theor. Comput. Sci., | 1998

Um estudo de problemas de redes lineares e não lineares.

Universidade do Porto Faculdade de Ciências | 1998

Prior information preshapes the population representation of movement direction in motor cortex

NeuroReport | 1998

A. Bastian

A. Riehle

G. Schöner

Monoids of orientation-preserving transformations of a finite chain and their presentations

The Monoid of orientation-preserving mappings and their presentations

Internacional Congresse on Semigroups and Applications | 1998

The Monoid of orientation-preserving mappings on a chain

Colchester, Reino Unido: Universidade de Essex | 1998

The Monoid of orientation-preserving mappings on a chain

Invariant differential operators and the Karlhede classification of Petrov type N spacetimes

Analytical and Numerical Approaches to Relativity: Sources of Gravitational Radiation; Publicacions de la Universitat de les Illes Baleares | 1998

Invariant differential operators and the Karlhede classification of type-N non-vacuum solutions

Classical and Quantum Gravity | 1998
DOI

The number of invariant polynomials of amatrix with prescribed complementary principal submatrices

Linear Algebra Appl | 1997