The behaviour of eigenfunctions and the spectrum of Sturm–Liouville operators. (Russian) Zbl 0056.34401
MSC:
34L40 | Particular ordinary differential operators (Dirac, one-dimensional Schrödinger, etc.) |
34L05 | General spectral theory of ordinary differential operators |
34L20 | Asymptotic distribution of eigenvalues, asymptotic theory of eigenfunctions for ordinary differential operators |
47E05 | General theory of ordinary differential operators |