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Resumen de Numerical index of Banach spaces and duality

Kostyantyn Boyko, Vladimir Kadets Árbol académico, Miguel Martín Suárez Árbol académico, Dirk Werner Árbol académico

  • 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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