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math.SP2025
On perturbations of the spectrum of one-dimensional PT-symmetric periodic Schrodinger operator
P. G. Grinevich, I. A. Taimanov
For PT-symmetric periodic Schrodinger operator, which is a small perturbation of the zero potential, we calculate the spectrum and the divisor of zeroes of the Bloch function in th…
math.SP2024
Finite-zone PT-potentials
I. A. Taimanov
We give a description of finite-zone PT-potentials in terms of explicit theta functional formulas.