Non-oscillation differential equations

The study deals with linear ordinary differential equations. The work is aimed at studying the topology of the boundary of the non-oscillability region of differential equations, as well as the topology of the space of linear ordinary differential equations with all periodic solutions. The number of homototic classes of non-degenerated immersions of the circle in S*99n R*99n and D*99n is calculated. M-property for complements to some configurations of flags is proved. The field of application covers the qualitative theory of differential equations, the theory of infinite Lie algebrasAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio