This paper consists of a study of the existence of periodic solutions of systems of nth order ordinary differential equations using tools from degree theory. Journal Information This monthly journal, ...

Existence and comparison theorems for eigenvalues of (k, n - k)-focal point and (k, n - k)-conjugate point problems are proved for a class of nth order linear differential equations for arbitrary n.

Time-domain finite-difference (TDFD) method is the most dominant approach for seismic wavefield simulation. Due to the memory and computational cost of the computer, finite-difference (FD) simulations ...