Mathematics – Functional Analysis
Scientific paper
2005-01-12
Mathematics
Functional Analysis
the introduction was changed and some remarks have been added. 26 pages ; to appear in Math. Z
Scientific paper
Let $\Omega$ be an open convex domain of the complex plane. We study
constants K such that $\Omega$ is K-spectral or complete K-spectral for each
continuous linear Hilbert space operator with numerical range included in
$\Omega$. Several approaches are discussed.
Badea Catalin
Crouzeix Michel
Delyon Bernard
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