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arXiv 2102.03086math.FA
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关于一致凸函数

On uniformly convex functions

Guillaume Grelier, Matías Raja

摘要:

非凸函数满足非闭点的一致凸性条件可以出现在离散构造中。我们证明了这种离散一致凸性是由凸包络所继承的,这是获得其他显著性质如凸性的关键。我们的技术允许检索Enflo的一致凸重赋范的超自反巴拿赫空间作为正规化的原始功能建立从树。在其他应用中,我们提供了一个尖锐的距离估计的一个给定的函数的差的Lipschitz凸函数的集合。最后,我们证明了几种量化巴拿赫空间子集的非超弱紧性的自然方式的等价性。

英文摘要:

Non-convex functions that yet satisfy a condition of uniform convexity for non-close points can arise in discrete constructions. We prove that this sort of discrete uniform convexity is inherited by the convex envelope, which is the key to obtain other remarkable properties such as the coercivity. Our techniques allow to retrieve Enflo's uniformly convex renorming of super-reflexive Banach spaces as the regularization of a raw function built from trees. Among other applications, we provide a sharp estimation of the distance of a given function to the set of differences of Lipschitz convex functions. Finally, we prove the equivalence of several natural fashions to quantify the non-super weakly compactness of a subset of a Banach space.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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