A Banach space with a symmetric basis which contains no or , and all its symmetric basic sequences are equivalent
A Characterization of M-Bases.
A Characterization of Totally Reflexive Fréchet Spaces.
A characterization of ω by block extensions
A generalization of Dragilev's theorem.
A Natural Class of Sequential Banach Spaces
We introduce and study a natural class of variable exponent spaces, which generalizes the classical spaces and c₀. These spaces will typically not be rearrangement-invariant but instead they enjoy a good local control of some geometric properties. Some geometric examples are constructed by using these spaces.
A new class of sequence spaces with applications in summability theory.
A new definition of nuclear systems with applications to bases in nuclear spaces
A new Expression of the Maximal Value of Banach Limits
A Note on Vanishing of the Factor Ext for Köthe Spaces.
A note on -multiplier convergent series
A short proof of the theorem of Crone and Robinson on quasi-equivalence of regular bases
A Twisted Fréchet Space with Basis.
Absolute bases, tensor products and a theorem of Bohr
Addendum and corrigendum to the paper "Several notions of absolute bases".
Addendum to: "Sequences of 0's and 1's" (Studia Math. 149 (2002), 75-99)
There is a nontrivial gap in the proof of Theorem 5.2 of [2] which is one of the main results of that paper and has been applied three times (cf. [2, Theorem 5.3, (G) in Section 6, Theorem 6.4]). Till now neither the gap has been closed nor a counterexample found. The aim of this paper is to give, by means of some general results, a better understanding of the gap. The proofs that the applications hold will be given elsewhere.
An Example of a Nuclear Fréchet Space Without the Bounded Approximation Property.
An internal characterization of G-spaces
Approximation von Elementen eines lokalkonvexen Raumes