Publications
Publicações

Publications

Linear operators preserving the numerical range (radius) on triangular matrices

Linear and Multilinear Algebra | 2001

C.-K. Li

P. Šemrl

Graph Products of Monoids

Semigroup Forum | 2001
DOI

On graph products of automatic monoids

RAIRO - Theoretical Informatics and Applications | 2001
DOI

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