We introduce the notion of the modulus of dentability defined for any point of the unit sphere S(X) of a Banach space X. We calculate effectively this modulus for denting points of the unit ball of the classical interpolation space $L¹ + L^{∞}.$ Moreover, a criterion for denting points of the unit ball in this space is given. We also show that none of denting points of the unit ball of $L¹ + L^{∞}$ is a LUR-point. Consequently, the set of LUR-points of the unit ball of $L¹ + L^{∞}$ is empty.
2
Dostęp do pełnego tekstu na zewnętrznej witrynie WWW
There are necessary conditions for a point x from the unit sphere to be a denting point of the unit ball of Orlicz spaces equipped with the Orlicz norm generated by arbitrary Orlicz functions. In contrast to results in [12, 17, 16], we present also examples of Orlicz spaces in which strongly extreme points of the unit ball are not denting points.
Here it is proved that the space \(L^{1}\cap L^{\infty }\) equipped with the standard interpolation norm \(\left\Vert \cdot \right\Vert _{L^{1}\cap L^{\infty }}=\max \left\{ \left\Vert \cdot \right\Vert _{L^{1}},\left\Vert \cdot \right\Vert _{L^{\infty }}\right\} \) has the uniform \(\lambda \)-property if and only if \(\mu (T)\leq 1.\) Replacing the standard norm with an equivalent one \(\left\Vert \cdot \right\Vert _{L^{1}\cap L^{\infty }}^{\prime }= \) \(\left\Vert \cdot \right\Vert _{L^{1}}+\left\Vert \cdot \right\Vert _{L^{\infty }}\), a different result is obtained.: \((L^{1}\cap L^{\infty }, \left\Vert \cdot \right\Vert _{L^{1}\cap L^{\infty }}^{\prime } )\) has the uniform \(\lambda \)-property if and only if \(\mu (T)
4
Dostęp do pełnego tekstu na zewnętrznej witrynie WWW
It is proved that for any Banach space X property (β) defined by Rolewicz in [22] implies that both X and X* have the Banach-Saks property. Moreover, in Musielak-Orlicz sequence spaces, criteria for the Banach-Saks property, the near uniform convexity, the uniform Kadec-Klee property and property (H) are given.
5
Dostęp do pełnego tekstu na zewnętrznej witrynie WWW
We discuss some sufficient and necessary conditions for strict K-monotonicity of some important concrete symmetric spaces. The criterion for strict monotonicity of the Lorentz space \(\Gamma _{p,w}\) with \(0\)
7
Dostęp do pełnego tekstu na zewnętrznej witrynie WWW
In this paper, a precise projection decomposition in reflexive, smooth and strictly convex Orlicz-Bochner spaces is given by the representation of the duality mapping. As an application, a representation of the metric projection operator on a closed hyperplane is presented.
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.