Morse's oscillation theorem for a degenerate case

[摘要] We consider the eigenvalue problem for a selfadjoint system of linear ordinary differential equations with general mixed boundary conditions which allow a combination of terms involving boundary values from the left and right end points. We obtain a precise formula for the Morse index of the problem which is valid even in the degenerate case. (C) 1997 Academic Press.

[发布日期] 1997-05-01