Spectral theory of the difference equation \(f(n+1) +f(n-1) = [E- \varphi(n)] f(n)\). (English) Zbl 0172.12305
Keywords:
ordinary differential equationsReferences:
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[2] | DOI: 10.1088/0370-1298/68/10/304 · Zbl 0065.23708 · doi:10.1088/0370-1298/68/10/304 |
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