Two problems of valdivia on distinguished Frechet spaces.
Polynomials and multilinear forms on spaces isomorphic to their cartesian square.
On the diagonal of matrix transformations
Una nota sobre los subespacios K-complementados de los espacios escalonados de sucesiones.
On the three-space property: non-containment of l, 1 ≤ p < ∞, or c subspaces.
The main result in this paper is the following: Let E be a Fréchet space having a normable subspace X isomorphic to l, 1 ≤ p < ∞, or to c. Let F be a closed subspace of E. Then either F or E/F has a subspace isomorphic to X.
Tensor stable Fréchet and (DF)-spaces.
In this paper we introduce and investigate classes of Fréchet and (DF)-spaces which constitute a very general frame in which the problem of topologies of Grothendieck and some related dual questions have a positive answer. Many examples of spaces in theses classes are provided, in particular spaces of sequences and functions. New counterexamples to the problems of Grothendieck are given.
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