On the basis property of the root function systems of regular boundary value problems for the Sturm-Liouville operator

2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/110238We consider the nonselfadjoint Sturm-Liouville operator Lu=u''-q(x)u with regular but not strongly regular boundary conditions, where q(x)is an arbitrary complex-valued summable function. We examine the basis property for the root function system of the mentioned operator.Submitted to Differ. UravnSpectral Theory34L10On the basis property of the root function systems of regular boundary value problems for the Sturm-Liouville operatortext