Lagrangian stability of a class of second-order periodic systems.
Landau-type inequalities and -bounded solutions of neutral delay systems.
Levin's comparison theorems for second order nonlinear differential equations and inequalities
Limit and integral properties of principal solutions for half-linear differential equations
Some asymptotic properties of principal solutions of the half-linear differential equation
Limit behavior of solutions of ordinary linear differential equations.
Linear differential equations of the 2nd order whose principal solution has unbounded logarithmic derivative
Linear perturbations of general disconjugate equations
Linearized comparison criteria for a nonlinear neutral differential equation
A class of nonlinear neutral differential equations with variable coefficients and delays is considered. Conditions for the existence of eventually positive solutions are obtained which extend some of the criteria existing in the literature. In particular, a linearized comparison theorem is obtained which establishes a connection between our nonlinear equations and a class of linear neutral equations with constant coefficients.
Long term behavior of solutions for Riccati initial-value problems.