Spectra of discrete symplectic eigenvalue problems with separated boundary conditions

Eliseeva, Yu. V.

doi:10.3103/s1066369x11110107

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Cited by 7 publications

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“…We call n a node of u if u(n) = 0 or a(n)u(n)u(n + 1) > 0 (1. 3) and say that a node n of u lies between m and l if either m < n < l or if n = m and u(m) = 0. The number of nodes of u between m and l is denoted as # (m,l) (u).…”

Section: Introductionmentioning

confidence: 99%

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Relative oscillation theory for Jacobi matrices extended

Ammannt¹

2014

Operators and Matrices

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Abstract. We present a comprehensive treatment of relative oscillation theory for finite Jacobi matrices. We show that the difference of the number of eigenvalues of two Jacobi matrices in an interval equals the number of weighted sign-changes of the Wronskian of suitable solutions of the two underlying difference equations. Until now only the case of perturbations of the main diagonal was known. We extend the known results to arbitrary perturbations, allow any (half-) open and closed spectral intervals, simplify the proof, and establish the comparison theorem.Mathematics subject classification (2010): Primary 39A21, 47B36; Secondary 34C10, 34L05.

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Section: Introductionmentioning

confidence: 99%

“…For the case of Dirac operators see Stadler and Teschl in [14]. For extensions to symplectic eigenvalue problems see Elyseeva [3][4][5].…”

Section: Introductionmentioning

confidence: 99%