On Second Order, Periodic, Symmetric, Differential Systems Having Subharmonics of All Sufficiently Large Orders

On the existence of positive periodic so

On the existence of positive periodic solutions of systems of second order differential equations

✍ Xiong Li; Ziheng Zhang 📂 Article 📅 2011 🏛 John Wiley and Sons 🌐 English ⚖ 117 KB

## Abstract In this paper, we establish several criteria for the existence, multiplicity, nonexistence of positive periodic solutions of the following system by combining some new properties of Green's function together with Krasnosel'skĭ fixed point theorem on the compression and expression of co