We derive a new Chambers-type formula and prove sharper upper bounds on the measure of the spectrum of critical almost Mathieu operators with rational frequencies.
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Svetlana Jitomirskaya, Lyuben Konstantinov, Igor Krasovsky, On the spectrum of critical almost Mathieu operators in the rational case. J. Spectr. Theory 12 (2022), no. 1, pp. 11–21DOI 10.4171/JST/392