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Unconditional biorthogonal wavelet bases in L p ( d )

Waldemar Pompe (2002)

Colloquium Mathematicae

We prove that a biorthogonal wavelet basis yields an unconditional basis in all spaces L p ( d ) with 1 < p < ∞, provided the biorthogonal wavelet set functions satisfy weak decay conditions. The biorthogonal wavelet set is associated with an arbitrary dilation matrix in any dimension.

Unconditionality of general Franklin systems in L p [ 0 , 1 ] , 1 < p < ∞

Gegham G. Gevorkyan, Anna Kamont (2004)

Studia Mathematica

By a general Franklin system corresponding to a dense sequence = (tₙ, n ≥ 0) of points in [0,1] we mean a sequence of orthonormal piecewise linear functions with knots , that is, the nth function of the system has knots t₀, ..., tₙ. The main result of this paper is that each general Franklin system is an unconditional basis in L p [ 0 , 1 ] , 1 < p < ∞.

Unconditionality of orthogonal spline systems in H¹

Gegham Gevorkyan, Anna Kamont, Karen Keryan, Markus Passenbrunner (2015)

Studia Mathematica

We give a simple geometric characterization of knot sequences for which the corresponding orthonormal spline system of arbitrary order k is an unconditional basis in the atomic Hardy space H¹[0,1].

Une nouvelle classe d'espaces de Banach vérifiant le théorème de Grothendieck

Gilles Pisier (1978)

Annales de l'institut Fourier

Soit W un espace 1 et soit R un sous-espace réflexif de dimension infinie de W . Nous montrons que le quotient W / R vérifie le théorème de Grothendieck, c’est-à-dire que tout opérateur de W / R dans un espace de Hilbert est 1-sommant; par ailleurs, W / R n’est pas un espace 1 . Cela permet de répondre négativement à une question de Lindenstrauss-Pełczyński ainsi qu’à une question similaire de Grothendieck.

Uniform convexity and associate spaces

Petteri Harjulehto, Peter Hästö (2018)

Czechoslovak Mathematical Journal

We prove that the associate space of a generalized Orlicz space L φ ( · ) is given by the conjugate modular φ * even without the assumption that simple functions belong to the space. Second, we show that every weakly doubling Φ -function is equivalent to a doubling Φ -function. As a consequence, we conclude that L φ ( · ) is uniformly convex if φ and φ * are weakly doubling.

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