Banach spaces with the 2 2 -summing property
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A Banach space X has the 2-summing property if the norm of every linear operator from A1 to a Hubert space is equal to the 2-summing norm of the operator. Up to a point, the theory of spaces which have this property is independent of the scalar field: the property is self-dual and any space with the property is a finite dimensional space of maximal distance to the Hubert space of the same dimension. In the case of real scalars only the real line and real l2∞have the 2-summing property. In the complex case there are more examples; e.g., all subspaces of complex l3∞and their duals. © 1995 American Mathematical Society.
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Arias, A., Figiel, T., Johnson, W. B., & Schechtman, G.
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Arias, A||Figiel, T||Johnson, WB||Schechtman, G
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