What are the local and global behavior of solutions of
$r'=r-r^3$
$\theta'=(\sin\theta)^2+a$
at the bifurcation value $a=-1$?
What are the local and global behavior of solutions of
$r'=r-r^3$
$\theta'=(\sin\theta)^2+a$
at the bifurcation value $a=-1$?