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arXiv 1609.01587math.FA
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巴拿赫空间的新模

New Moduli for Banach Spaces

Grigiry Ivanov, Horst Martini

摘要:

通过修改支持凸性和支持光滑性的模,我们在巴拿赫空间中引入了新的模,例如,作为直角三角形的直角三角形的长度(通过所谓的准正交性定义)。这些三角形有两个边界点的单位球的巴拿赫空间作为端点的使用,和他们的第三个顶点位于一个支撑超平面的其他两个顶点之一。除此之外,我们的目标是通过这样的三角形量化单位球从其支撑超平面的局部偏差。我们证明了各自的Day-Nordlander型结果,涉及推广的凸性模和模的Banaeros。

英文摘要:

Modifying the moduli of supporting convexity and supporting smoothness, we introduce new moduli for Banach spaces which occur, e.g., as lengths of catheti of right-angled triangles (defined via so-called quasi-orthogonality). These triangles have two boundary points of the unit ball of a Banach space as endpoints of their hypotenuse, and their third vertex lies in a supporting hyperplane of one of the two other vertices. Among other things it is our goal to quantify via such triangles the local deviation of the unit sphere from its supporting hyperplanes. We prove respective Day-Nordlander type results, involving generalizations of the modulus of convexity and the modulus of Banaś.

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