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Brief communications
A Sufficient Nonsingularity Condition for a Discrete Finite-Gap One-Energy Two-Dimensional Schrödinger Operator on the Quad-Graph
B. O. Vasilevskii Lomonosov Moscow State University, Faculty of Mechanics and Mathematics
Abstract:
The finite-gap approach is used to construct a two-dimensional discrete Schrödinger operator on a quad-graph, that is, a planar graph whose faces are quadrangles. The following definition of the nonsingularity of this operator is proposed: An operator is nonsingular if all of its coefficients are positive. Conditions on a spectral curve and a quad-graph sufficient for the operator constructed from them to be nonsingular are given.
Keywords:
discrete operator, discrete complex analysis, finite-gap operator, spectral curve, M-curve, Riemann surface, nonsingularity.
Received: 11.11.2013
Citation:
B. O. Vasilevskii, “A Sufficient Nonsingularity Condition for a Discrete Finite-Gap One-Energy Two-Dimensional Schrödinger Operator on the Quad-Graph”, Funktsional. Anal. i Prilozhen., 49:3 (2015), 65–70; Funct. Anal. Appl., 49:3 (2015), 210–213
Linking options:
https://www.mathnet.ru/eng/faa3199https://doi.org/10.4213/faa3199 https://www.mathnet.ru/eng/faa/v49/i3/p65
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Abstract page: | 300 | Full-text PDF : | 125 | References: | 37 | First page: | 11 |
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