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math.FA2026
On the existence of extremizers for the sum of eigenvalues of Toeplitz operators
Fabio Nicola, Federico Riccardi, Paolo Tilli
We prove that, among all measurable sets of prescribed Lebesgue measure, there exists a set maximizing the sum of the first eigenvalues () of the…
math.FA2025
The isoperimetric inequality for partial sums of Toeplitz eigenvalues in the Fock space
Fabio Nicola, Federico Riccardi, Paolo Tilli
We prove that, among all subsets having circular symmetry and prescribed measure, the ball is the only maximizer of the sum of the first eigenvalues ($K\…