Then, for this critical driving amplitude mmin , the fractional amplitudes An−1 /A1 and An+1 /A1 of high harmonics for a given order n can be easily found as the solutions to the homogeneous system of equations, equations (10).
The limit of mmin , equation (11), at n → ∞ gives an improved formula for the
lower boundary of the dynamic stabilization of the inverted pendulum instead of the
commonly known (and mentioned above) approximate criterion