Now showing items 1-3 of 3
The focal boundary value problem for strongly singular higher-order nonlinear functional-differential equations
(Springer Nature, 2015-01-30)
The a priori boundedness principle is proved for the two-point right-focal boundary value problems for strongly singular higher-order nonlinear functional-differential equations. Several sufficient conditions of solvability ...
The nonlinear Kneser problem for singular in phase variables second-order differential equations
For the singular in phase variables differential equation u'' = f (t, u, u') ), sufficient conditions are found for the existence of a solution satisfying the conditions Phi(u) = c, u(t) > 0, u'(t) < 0 for t > 0, where Phi ...
Lasota–Opial type conditions for periodic problem for systems of higher-order functional differential equations
(BioMed Central, 2020-06-05)
In the paper we study the question of solvability and unique solvability of systems of the higher-order functional differential equations. In the paper in some sense optimal conditions that guarantee the unique solvability ...