Problems which lead to a generalization of the concept of an ordinary nonlinear differential equation
The existence and multiplicity results are shown for certain types of problems with nonlinear boundary value conditions.
In this paper two sequences of oscillation criteria for the self-adjoint second order differential equation are derived. One of them deals with the case , and the other with the case .
This paper is concerned with the traveling wave solutions and asymptotic spreading of delayed lattice differential equations without quasimonotonicity. The spreading speed is obtained by constructing auxiliary equations and using the theory of lattice differential equations without time delay. The minimal wave speed of invasion traveling wave solutions is established by investigating the existence and nonexistence of traveling wave solutions.