Perturbation theory of differential operators
Nyamwala, Fredrick Oluoch
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Suppose that M and S are differential operators and T is given by T = M-zS, where z is the spectral parameter. Here, we give the necessary and sufficient conditions for the deficiency indices and spectral properties of selfadjoint realisations of T and M to be equal on Hilbert spaces of square integrable functions.
- SIMC 2017