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arxiv: math/0509374 · v1 · pith:QTJLNDIBnew · submitted 2005-09-16 · 🧮 math.FA

Numerical index and duality

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keywords indexnumericaldualspaceanswerbanachbeenbeginning
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We present an example of a Banach space whose numerical index is strictly greater than the numerical index of its dual, giving a negative answer to a question which has been latent since the beginning of the seventies. We also show a particular case in which the numerical index of the space and the one of its dual coincide.

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