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Analytic Renormings of C(K) Spaces

Hájek, Petr — 1996

Serdica Mathematical Journal

The aim of our present note is to show the strength of the existence of an equivalent analytic renorming of a Banach space, even compared to C∞-Fréchet smooth renormings. It was Haydon who first showed in [8] that C(K) spaces for K countable admit an equivalent C∞-Fréchet smooth norm. Later, in [7] and [9] he introduced a large clams of tree-like (uncountable) compacts K for which C(K) admits an equivalent C∞-Fréchet smooth norm. Recently, it was shown in [3] that C(K) spaces for K countable admit...

Uniform Eberlein Compacta and Uniformly Gâteaux Smooth Norms

Fabian, MariánHájek, PetrZizler, Václav — 1997

Serdica Mathematical Journal

* Supported by grants: AV ĈR 101-95-02, GAĈR 201-94-0069 (Czech Republic) and NSERC 7926 (Canada). It is shown that the dual unit ball BX∗ of a Banach space X∗ in its weak star topology is a uniform Eberlein compact if and only if X admits a uniformly Gâteaux smooth norm and X is a subspace of a weakly compactly generated space. The bidual unit ball BX∗∗ of a Banach space X∗∗ in its weak star topology is a uniform Eberlein compact if and only if X admits a weakly uniformly rotund norm....

On convex functions in c(w).

Petr Hájek — 1996

Collectanea Mathematica

It is proved that no convex and Fréchet differentiable function on c(w), whose derivative is locally uniformly continuous, attains its minimum at a unique point.

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