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Generalized metric properties of spheres and renorming of normed spaces

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arxiv 1605.08175 v2 pith:JPMTRUZC submitted 2016-05-26 math.FA math.GN

Generalized metric properties of spheres and renorming of normed spaces

classification math.FA math.GN
keywords dualnormweakpropertiesspacebanachequivalentgeneralized
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abstract

We study some generalized metric properties of weak topologies when restricted to the unit sphere of some equivalent norm on a Banach space, and their relationships with other geometrical properties of norms. In case of dual Banach space $X^*$, we prove that there exists a dual norm such that its unit sphere is a Moore space for the weak$^*$-topology (has a G$_\delta$-diagonal for the weak$^*$-topology, respectively) if, and only if, $X^*$ admits an equivalent weak$^*$-LUR dual norm (rotund dual norm, respectively).

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