Variable multistep methods
Variational Lyapunov method and stability theory.
Variational method and conjugacy criteria for half-linear differential equations
We establish new conjugacy criteria for half-linear second order differential equations. These criteria are based on the relationship between conjugacy of the investigated equation and nonpositivity of the associated energy functional.
Verallgemeinerte gewöhnliche Differentialgleichungen; Systeme mit Impulsen auf Flächen. II
Verallgemeinerte gewöhnliche Differentialgleichungen; Systeme mit Impulsen auf Flächen. I