On the surjective Dunford-Pettis property
On The Symmetric Quaternionic Banach Algebras, I (Geljfand Theory)
On the Sz.-Nagy boundedness condition on abelian involution semigroups
On the tangency of multifunctions
On the tensor product weakly compact operators.
On the tensor products of maximal abelian JW-algebras.
On the Tensor Stability of s-Number Ideals.
On the theorems of Hartogs and Bishop
On the theory of Sobolev-type classes of functions with values in a metric space.
On the Thickness of the Shilov Boundary.
On the "Three space problem".
On the three-space problem and the lifting of bounded sets.
We exhibit a general method to show that for several classes of Fréchet spaces the Three-space-problem fails. This method works for instance for the class of distinguished Fréchet spaces, for Fréchet spaces with the density condition and also for dual Fréchet spaces (which gives a negative answer to a question of D. Vogt). An example of a Banach space, which is not a dual Banach space but the strong dual of a DF-space, shows that there are two real different possibilities of defining the notion...
On the three-space property for locally convex spaces.
On the three-space property: non-containment of lp, 1 ≤ p < ∞, or c0 subspaces.
The main result in this paper is the following: Let E be a Fréchet space having a normable subspace X isomorphic to lp, 1 ≤ p < ∞, or to c0. Let F be a closed subspace of E. Then either F or E/F has a subspace isomorphic to X.
On the Three-space-problem for df Spaces and Their Duals
On the three-space-problem for topological vector spaces.
On the topological reflexivity of the isometry group of the suspension of B(H)
We describe the topological reflexive closure of the isometry group of the suspension of B(H).
On the topology induced by the adjoint of a semigroup of operators.
On the topology of compactoid convergence in non-Archimedean spaces
On the Topology of the Spectrum of a C+-Algebra.