Some Results on Absolute Projection Constants

Some Results on Absolute Projection Constants
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关于绝对投影常数的一些结果

DOI:
10.1080/01630563.2018.1486327
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发表时间:
2019
影响因子:
1.2
通讯作者:
Alberto Martín
Alberto Martín
中科院分区:
数学4区
文献类型:
--
作者:
A. Castejón;G. Lewicki;Alberto Martín

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设V是n维真实的或复Banach空间,记V的绝对投影常数。对于任何定义在这篇文章中,我们确定,在复杂的情况下,最小的投影关于l1-范数以及关于-范数的子空间的某些极值问题的解决方案。作为一个应用,我们证明了对于任何一个,存在一个n维子空间使得这推广了Castejon和Lewicki(2014)在真实的情况下得到的结果。
Abstract Let V be an n-dimensional real or complex Banach space and let denote its absolute projection constant. For any define In this article, we determine, in the complex case, minimal projections with respect to l1-norm as well as with respect to -norm for subspaces given by solutions of certain extremal problems. As an application we show that for any , there exists an n-dimensional subspace such that This generalizes the results from Castejon and Lewicki (2014) obtained in the real case.