What are the local and global behavior of solutions of
$\left\{\begin{array}{ll}r'&=r−r^2\\ \theta'&=(\sin\theta /2)^2+a\end{array}\right.$ at all bifurcation values?
What are the local and global behavior of solutions of
$\left\{\begin{array}{ll}r'&=r−r^2\\ \theta'&=(\sin\theta /2)^2+a\end{array}\right.$ at all bifurcation values?