Abstract:
We present new proofs of the theorem on the width of the forbidden regions for the Hill equation with a small potential and the theorem on the width of the parametric resonance regions for a first-order differential equation on a torus. These results are special cases of the theorem proved in this paper by the normal form method.
Citation:
S. Yu. Sadov, “Width of parametric resonance regions for equations on a torus”, Mat. Zametki, 64:1 (1998), 129–135; Math. Notes, 64:1 (1998), 110–115