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Gateaux derivative of C⁎ norm
Linear Algebra and its Applications ( IF 1.1 ) Pub Date : 2021-07-29 , DOI: 10.1016/j.laa.2021.07.019 Sushil Singla 1
中文翻译:
C⁎ 范数的 Gateaux 导数
更新日期:2021-08-03
Linear Algebra and its Applications ( IF 1.1 ) Pub Date : 2021-07-29 , DOI: 10.1016/j.laa.2021.07.019 Sushil Singla 1
Affiliation
We find an expression for the Gateaux derivative of the -algebra norm. Using this, we obtain a characterization of orthogonality of an operator to a subspace, under the assumption . We obtain an expression for the subdifferential set of the norm function at when . We also give new proofs of known results on the closely related notions of smooth points and Birkhoff-James orthogonality for the spaces and , respectively.
中文翻译:
C⁎ 范数的 Gateaux 导数
我们找到了 Gateaux 导数的表达式 -代数范数。使用这个,我们获得了一个算子正交性的特征 到子空间,在假设下 . 我们获得了范数函数的次微分集的表达式在 什么时候 . 我们还给出了关于空间的光滑点和 Birkhoff-James 正交性的密切相关概念的已知结果的新证明 和 , 分别。