Positive solutions of singular four-point boundary value problem with -Laplacian.
Positive solutions of singular initial-boundary value problems to second-order functional differential equations.
Positive solutions of singular multipoint boundary value problems for systems of nonlinear second-order differential equations on infinite intervals in Banach spaces.
Positive solutions of some higher order nonlocal boundary value problems.
Positive solutions of three-point boundary value problems for higher-order -Laplacian with infinitely many singularities.
Positive solutions to boundary value problems of nonlinear fractional differential equations.
Positive solutions to nonlinear first-order nonlocal BVPs with parameter on time scales.
Positive solutions to singular and delay higher-order differential equations on time scales.
Positive symmetric solutions of singular semipositone boundary value problems.
Preservation of exponential stability for equations with several delays
We consider preservation of exponential stability for the scalar nonoscillatory linear equation with several delays under the addition of new terms and a delay perturbation. We assume that the original equation has a positive fundamental function; our method is based on Bohl-Perron type theorems. Explicit stability conditions are obtained.