Portugaliae Mathematica

G. Emmanuele:
Some Remarks on Lifting of Isomorphic Properties to Injective and Projective Tensor Products

Gracinda M.S. Gomes, John M. Howie:
A $P$-Theorem for Inverse Semigroups with Zero

C. De Coster, P. Habets:
A Two Parameters Ambrosetti-Prodi Problem

S. Pilipovic, D. Scarpalézos:
Differential Operators with Generalized Constant Coefficients

Ming Luo:
Pentagonal Numbers in the Lucas Sequence

Pentti Haukkanen, Jun Wang:
A Generalization of Menon's Identity with Respect to a Set of Polynomials

M.S.M. Roversi, A.O. Chiacchio, M.L.B. Queiroz:
Convergence of Approximation Processes on Convex Cones

Milan A. Kovacevic, Gradimir V. Milovanovic:
Spline Approximation and Generalized Turan Quadratures

P.E. Oliveira, Ch. Suquet:
An $L^{2}[0,1]$ Invariance Principle for LPQD Random Variables