High-energy asymptotics of Titchmarsh-Weyl functions are obtained for generalised canonical systems, generalizing a Gesztesy-Simon result, along with a new identity for the matrix amplitude function.
Sakhnovich, On the class of canonical systems correspon ding to matrix string equations: general-type and explicit fundamental solutions and Weyl–Titchmarsh theory
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Generalised canonical systems related to matrix string equations: corresponding structured operators and high-energy asymptotics of the Weyl functions
High-energy asymptotics of Titchmarsh-Weyl functions are obtained for generalised canonical systems, generalizing a Gesztesy-Simon result, along with a new identity for the matrix amplitude function.