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Nonclassical Sturm-Liouville problems and Schrödinger operators on radial trees. (English) Zbl 0960.34070

Summary: Schrödinger operators on graphs with weighted edges may be defined using possibly infinite systems of ordinary differential operators. This work mainly considers radial trees, whose branching and edge lengths depend only on the distance from the root vertex. The analysis of operators with radial coefficients on radial trees is reduced, by a method analogous to separation of variables, to nonclassical boundary value problems on the line with interior point conditions. This reduction is used to study selfadjoint problems requiring boundary conditions ‘at infinity’.

MSC:

34L40 Particular ordinary differential operators (Dirac, one-dimensional Schrödinger, etc.)
34B24 Sturm-Liouville theory
34B10 Nonlocal and multipoint boundary value problems for ordinary differential equations
47E05 General theory of ordinary differential operators
34A35 Ordinary differential equations of infinite order