Perturbations of periodic Sturm--Liouville operators

Jussi Behrndt, Philipp Schmitz, Gerald Teschl +1

We study perturbations of the self-adjoint periodic Sturm--Liouville operator \[ A_0 = \frac{1}{r_0}\left(-\frac{\mathrm d}{\mathrm dx} p_0 \frac{\mathrm d}{\mathrm dx} + q_0\right…