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On the lambda-property and computation of the lambda-function of some normed spaces.

Mohamed Akkouchi, Hassan Sadiky (1993)

Extracta Mathematicae

R. M. Aron and R. H. Lohman introduced, in [1], the notion of lambda-property in a normed space and calculated the lambda-function for some classical normed spaces. In this paper we give some more general remarks on this lambda-property and compute the lambda-function of other normed spaces, namely: B(S,∑,X) and Md(E).

On the Lebesgue decomposition of the normal states of a JBW-algebra

Jacques Dubois, Brahim Hadjou (1992)

Mathematica Bohemica

In this article, a theorem is proved asserting that any linear functional defined on a JBW-algebra admits a Lebesque decomposition with respect to any normal state defined on the algebra. Then we show that the positivity (and the unicity) of this decomposition is insured for the trace states defined on the algebra. In fact, this property can be used to give a new characterization of the trace states amoungst all the normal states.

On the Lifshits Constant for Hyperspaces

K. Leśniak (2007)

Bulletin of the Polish Academy of Sciences. Mathematics

The Lifshits theorem states that any k-uniformly Lipschitz map with a bounded orbit on a complete metric space X has a fixed point provided k < ϰ(X) where ϰ(X) is the so-called Lifshits constant of X. For many spaces we have ϰ(X) > 1. It is interesting whether we can use the Lifshits theorem in the theory of iterated function systems. Therefore we investigate the value of the Lifshits constant for several classes of hyperspaces.

On the Lipschitz operator algebras

A. Ebadian, A. A. Shokri (2009)

Archivum Mathematicum

In a recent paper by H. X. Cao, J. H. Zhang and Z. B. Xu an α -Lipschitz operator from a compact metric space into a Banach space A is defined and characterized in a natural way in the sence that F : K A is a α -Lipschitz operator if and only if for each σ X * the mapping σ F is a α -Lipschitz function. The Lipschitz operators algebras L α ( K , A ) and l α ( K , A ) are developed here further, and we study their amenability and weak amenability of these algebras. Moreover, we prove an interesting result that L α ( K , A ) and l α ( K , A ) are isometrically...

On the local moduli of squareness

Antonio J. Guirao (2008)

Studia Mathematica

We introduce the notions of pointwise modulus of squareness and local modulus of squareness of a normed space X. This answers a question of C. Benítez, K. Przesławski and D. Yost about the definition of a sensible localization of the modulus of squareness. Geometrical properties of the norm of X (Fréchet smoothness, Gâteaux smoothness, local uniform convexity or strict convexity) are characterized in terms of the behaviour of these moduli.

Currently displaying 1341 – 1360 of 1948