Positive and oscillating solutions of differential equations with delay in critical case
The article is devoted to the existence of positive solutions to nonlinear retarded functional-differential equations. Some criteria of existence and some comparison results are proved. The existence of positive and oscillation solutions to the equation \(x'(t)=-a(t)x(t-\tau)\) in the critical case is proved.
scientific article; zbMATH DE number 1135873