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<p>We show that for real Banach spaces that are either separable or dual spaces, the Lipschitz numerical index coincides with the classical (linear) numerical index. This result provides partial evidence toward the question posed by Wang et al. (J Math Anal Appl 411:1–18, 2014) of whether these two quantities coincide for every real Banach space. Our approach relies on two standard linearization techniques for Lipschitz maps: differentiation via convolution with Gaussian probability measures and invariant means.</p>

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Lipschitz vs Linear Numerical Index in Certain Banach Spaces

  • 期刊论文

  • 发表日期：

    2026年1月14日

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  • Antonio Pérez-Hernández

摘要

We show that for real Banach spaces that are either separable or dual spaces, the Lipschitz numerical index coincides with the classical (linear) numerical index. This result provides partial evidence toward the question posed by Wang et al. (J Math Anal Appl 411:1–18, 2014) of whether these two quantities coincide for every real Banach space. Our approach relies on two standard linearization techniques for Lipschitz maps: differentiation via convolution with Gaussian probability measures and invariant means.