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Quotients of Banach Spaces with the Daugavet Property

Vladimir KadetsVarvara ShepelskaDirk Werner — 2008

Bulletin of the Polish Academy of Sciences. Mathematics

We consider a general concept of Daugavet property with respect to a norming subspace. This concept covers both the usual Daugavet property and its weak* analogue. We introduce and study analogues of narrow operators and rich subspaces in this general setting and apply the results to show that a quotient of L₁[0,1] by an ℓ₁-subspace need not have the Daugavet property. The latter answers in the negative a question posed to us by A. Pełczyński.

Narrow operators and rich subspaces of Banach spaces with the Daugavet property

Vladimir M. KadetsRoman V. ShvidkoyDirk Werner — 2001

Studia Mathematica

Let X be a Banach space. We introduce a formal approach which seems to be useful in the study of those properties of operators on X which depend only on the norms of the images of elements. This approach is applied to the Daugavet equation for norms of operators; in particular we develop a general theory of narrow operators and rich subspaces of spaces X with the Daugavet property previously studied in the context of the classical spaces C(K) and L₁(μ).

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