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arxiv: 0806.1815 · v1 · pith:IRTVBGYNnew · submitted 2008-06-11 · 🧮 math.FA

Quotients of Banach spaces with the Daugavet property

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keywords daugavetpropertyconceptgeneralsubspaceanalogueanaloguesanswers
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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 for narrow operators and rich subspaces in this general setting and apply the results to show that a quotient of $L_1[0,1]$ over an $\ell_1$-subspace can fail the Daugavet property. The latter answers a question posed to us by A. Pelczynski in the negative.

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