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Published August 1990 | public
Journal Article

On the measure of the spectrum for the almost Mathieu operator

Abstract

We obtain partial results on the conjecture that for the almost Mathieu operator at irrational frequency, α, the measure of the spectrum, S(α, λ, ϑ)=|4–2|λ‖. For |λ|≠2 we show that if α_n is rational and α_n→α irrational, then S+(α_n,λ,θ)→|4−2|λ||.

Additional Information

© 1990 Springer-Verlag. Received: 04 December 1989. Research partially supported by U.S. NSF grant number DMS-8801918 and by BSF under grant number 88-00325.

Additional details

Created:
August 19, 2023
Modified:
October 17, 2023