Weak-Coppel problem for a class of Riccati differential equations

Armengol Gasull, Douglas D. Novaes, Joan Torregrosa

We study the $T$-periodic solutions of the real Riccati differential equation $x^{\prime }=x^2+{\hat{I}}^3(t),$ where $x=x(t)$ and ${\hat{I}}^3$ is a $T$-periodic function. Our goal is to define a real-v…