New upper and lower bounds on spectral constants K(A_r) for the quantum annulus and polyannulus, with two alternative proofs of an existing estimate and separate results for commuting operators.
Crouzeix,Spectral estimates in the quantum annulus and in the numerical annulus, arXiv: 2512.11813
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Spectral constants for the quantum annulus
New upper and lower bounds on spectral constants K(A_r) for the quantum annulus and polyannulus, with two alternative proofs of an existing estimate and separate results for commuting operators.