Simon's higher-order Szegő sum-rule conjecture
Simon's higher-order Szegő sum-rule conjecture
Let be the density of the absolutely continuous part of a measure on the unit circle, let be its Verblunsky-coefficient sequence, and let be the left shift operator, . For distinct and strictly positive integers , set . Simon's higher-order Szegő conjecture. The condition
should be equivalent to
This conjecture was subsequently shown to be false: for , , and , Lukic constructed a counterexample for which the sequence condition holds but the integral equals .
Sources & referencesView supporting material
Primary source
Zhihua Du, “Sum rules and Simon spectral gem problem on higher order Szegő theorems”, arXiv:2312.01323 (2023).
Additional references
2 papers in this index state this conjecture (2012–2023). The statement above is taken from the most recent of them; the others are arXiv:1210.6953.
Progress summary
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