Portugaliae Mathematica

C.O.R. Sarrico:
The Linear Cauchy Problem for a Class of Differential Equations with Distributional Coefficients

Gheorghe Udrea:
Catalan's Identity and Chebyshev Polynomials of the Second Kind

Miguel Caldas Cueva:
Semi-Generalized Continuous Maps in Topological Spaces

Fernando Manuel Sequeira:
Les Espaces $\calc{H}(\Omega)$ et le Calcul Symbolique de Sebastiao e Silva

H. Bessaih:
Limite de Modeles de Fluides Compressibles

Xinde Deng, George Szeto:
Azumaya Algebras of a Ring with a Finite Automorphism Group

Adrian Constantin:
Positive Solutions of Elliptic Equations in Two-Dimensional Exterior Domains

J. Orestes Cerdeira, Paulo Barcia:
When is a 0-1 Knapsack a Matroid?

José Miguel Urbano:
A Stationary Stefan Problem with Convection and Nonlinear Diffusion

N.H. Abdel-All:
Singular Klein Manifolds