Bifurcation diagram: equilibria u*(h) of u³ − 3u = h
Restoring force f(u) = h + 3u − u³  ·  phase line below
stable branch / equilibrium unstable (saddle) current h
Bifurcation parameter h 0.00
equilibria
—
—
lower stable α
—
u* = —
upper stable α
—
u* = —