Order problem for canonical systems and a conjecture of Valent
by R. Romanov PDF
Trans. Amer. Math. Soc. 369 (2017), 1061-1078 Request permission
We establish a sharp upper estimate for the order of a canonical system in terms of the Hamiltonian. This upper estimate becomes an equality in the case of Krein strings. As an application we prove a conjecture of Valent about the order of a certain class of Jacobi matrices with polynomial coefficients.
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R. Romanov
Affiliation: Department of Mathematical Physics and Laboratory of Quantum Networks, Faculty of Physics, St. Petersburg State University, 198504, St. Petersburg, Russia
Email: morovom@gmail.com
Received by editor(s): September 22, 2014
Received by editor(s) in revised form: February 9, 2015
Published electronically: May 3, 2016
Additional Notes: This work was supported in part by the Austrian Science Fund (FWF) project I 1536–N25, the Russian Foundation for Basic Research, grants 13-01-91002-ANF and 12-01-00215, and by Project SPbSU 11.38.263.2014
Journal: Trans. Amer. Math. Soc. 369 (2017), 1061-1078
MSC (2010): Primary 34L15, 47B36
DOI: https://doi.org/10.1090/tran6686