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arXiv 0706.0633math.FA
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非自反巴拿赫空间上连续凸函数的商

Quotients of continuous convex functions on nonreflexive Banach spaces

P. Holicky, O. Kalenda, L. Vesely, L. Zajicek

摘要:

在每个非自反巴拿赫空间X上,存在正连续凸函数f使得1/f不是d.c.函数(即,两个连续凸函数的差)。这个结果与已知结果一起意味着X是自反的当且仅当两个连续凸函数的每一个处处定义的商是d.c.函数。我们的构造还给出了克利关于非自反空间和非范达到泛函的重赋结果的更强版本。

英文摘要:

On each nonreflexive Banach space X there exists a positive continuous convex function f such that 1/f is not a d.c. function (i.e., a difference of two continuous convex functions). This result together with known ones implies that X is reflexive if and only if each everywhere defined quotient of two continuous convex functions is a d.c. function. Our construction gives also a stronger version of Klee's result concerning renormings of nonreflexive spaces and non-norm-attaining functionals.

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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