Positive periodic solutions and eigenvalue intervals for systems of second order differential equations

Abstract In this paper, we employ a well‐known fixed point theorem for cones to study the existence of positive periodic solutions to the n ‐dimensional system x ″ + A ( t ) x = H ( t ) G ( x ). Moreover, the eigenvalue intervals for x ″ + A ( t ) x = λH ( t ) G ( x ) are easily characterized. (© 20... View More