Evangelos A. Nikitopoulos

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20202026

C^{k}

functions and Fréchet derivatives of operator functions

5 citations · 16 across the 11 of their papers we have counts for

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math.FA2026

Lexicographic functional calculus and its application to functional calculus calculus

Evangelos A. Nikitopoulos

Let $A$ be a unital $C^{*}$ -algebra and $I$ be a symmetrically normed ideal of $A$ . I introduce and study lexicographic functional calculus (LFC), a kind of multivariate functional c…

math.FA2020★ 5 cited

Noncommutative $C^{k}$ functions and Fréchet derivatives of operator functions

Evangelos A. Nikitopoulos

Fix a unital $C^{*}$ -algebra $A$ , and write $A_{s a}$ for the set of self-adjoint elements of $A$ . Also, if $f : R \to C$ is a continuous f…

Lexicographic functional calculus and its application to functional calculus calculus

Noncommutative Ck functions and Fréchet derivatives of operator functions

Noncommutative $C^{k}$ functions and Fréchet derivatives of operator functions