Principal functions of non-selfadjoint matrix Sturm-Liouville equations
The paper investigates the properties of the principal functions corresponding to the eigenvalues and spectral singularities of the boundary value problem \[ -y'' + Q(x)y = \lambda^{2}y \,, \;\;\;x\in [0,\infty) , \] \[ y(0) = 0\,, \] where \(Q\) is a non-selfadjoint matrix-valued function.
scientific article; zbMATH DE number 5931005