Finite-dimensional Banach spaces with symmetry constant of order √n
P. Mankiewicz (1984)
Studia Mathematica
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P. Mankiewicz (1984)
Studia Mathematica
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M. Fabian (1995)
Studia Mathematica
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Let ℛ denote some kind of rotundity, e.g., the uniform rotundity. Let X admit an ℛ-norm and let Y be a reflexive subspace of X with some ℛ-norm ∥·∥. Then we are able to extend ∥·∥ from Y to an ℛ-norm on X.
Eva Bayer-Fluckiger, Gabriele Nebe (2005)
Journal de Théorie des Nombres de Bordeaux
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General methods from [3] are applied to give good upper bounds on the Euclidean minimum of real quadratic fields and totally real cyclotomic fields of prime power discriminant.
Sébastien Gouëzel (2005)
Annales de l'I.H.P. Probabilités et statistiques
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Yehoram Gordon, Marius Junge (1999)
Studia Mathematica
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There exists an absolute constant such that for any n-dimensional Banach space E there exists a k-dimensional subspace F ⊂ E with k≤ n/2 such that . The concept of volume ratio with respect to -spaces is used to prove the following distance estimate for : .
Sholomo Reisner (1981)
Annales de l'institut Fourier
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-convexity and -concavity of a Banach lattice are characterized by factorization of multiplication operators from into through . This characterization is applied to calculate the concavity type of Lorentz spaces.
Andrei Duma, Marius Stoka (2002)
Bollettino dell'Unione Matematica Italiana
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We solve problems of Buffon type for a lattice with elementary tile a nonconvex polygon, using as test bodies a line sigment and a circle.