| Abstract: |
| We study the existence of subharmonic solutions and solutions with
complicated dynamics in a pendulum equation subjected to a
periodic forcing term which is allowed to have nonzero mean value.
Our choice of the periodic perturbation is that of forcing term
close to a step function which can be interpreted as two
alternating torques, according to a model originally studied by F.
Tricomi (1931-1933). The proofs are based on a topological
approach. |
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