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On recovering a Sturm–Liouville-type operator with the frozen argument rationally proportioned to the interval length

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Published/Copyright: March 8, 2019

Abstract

We consider the operator y:=-y′′(x)+q(x)y(a), 0<x<π, y(0)=y(π)=0, where q(x)L2(0,π) is a complex-valued function and a/π[0,1] is a rational number. The inverse problem of recovering the potential q(x) from the spectrum of is studied. We describe the sets of iso-spectral potentials and prove the uniqueness theorem in the class of potentials possessing some symmetry-type property. Moreover, we obtain a constructive procedure for solving this inverse problem along with necessary and sufficient conditions of its solvability, which in turn give the characterization of the spectrum. In parallel, we establish that the informativity of the spectrum is severely unstable with respect to the parameter a.

MSC 2010: 34A55; 34K29

Award Identifier / Grant number: 1.1660.2017/4.6

Award Identifier / Grant number: 19-01-00102

Funding statement: This research was supported in part by RFBR (Grant 19-01-00102) and by the Ministry of Education and Science of RF (Grant 1.1660.2017/4.6).

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Received: 2018-05-23
Revised: 2018-10-22
Accepted: 2019-01-28
Published Online: 2019-03-08
Published in Print: 2019-06-01

© 2019 Walter de Gruyter GmbH, Berlin/Boston

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