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A new class of weakly K -analytic Banach spaces

Sophocles MercourakisE. Stamati — 2006

Commentationes Mathematicae Universitatis Carolinae

In this paper we define and investigate a new subclass of those Banach spaces which are K -analytic in their weak topology; we call them strongly weakly K -analytic (SWKA) Banach spaces. The class of SWKA Banach spaces extends the known class of strongly weakly compactly generated (SWCG) Banach spaces (and their subspaces) and it is related to that in the same way as the familiar classes of weakly K -analytic (WKA) and weakly compactly generated (WCG) Banach spaces are related. We show that: (i) not...

A note on the structure of WUR Banach spaces

Spiros A. ArgyrosSophocles Mercourakis — 2005

Commentationes Mathematicae Universitatis Carolinae

We present an example of a Banach space E admitting an equivalent weakly uniformly rotund norm and such that there is no Φ : E c 0 ( Γ ) , for any set Γ , linear, one-to-one and bounded. This answers a problem posed by Fabian, Godefroy, Hájek and Zizler. The space E is actually the dual space Y * of a space Y which is a subspace of a WCG space.

Isometric embeddings of a class of separable metric spaces into Banach spaces

Sophocles K. MercourakisVassiliadis G. Vassiliadis — 2018

Commentationes Mathematicae Universitatis Carolinae

Let ( M , d ) be a bounded countable metric space and c > 0 a constant, such that d ( x , y ) + d ( y , z ) - d ( x , z ) c , for any pairwise distinct points x , y , z of M . For such metric spaces we prove that they can be isometrically embedded into any Banach space containing an isomorphic copy of .

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