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Non-continuation of the periodic oscillations of a forced pendulum in the presence of friction |
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| Authors: | Rafael Ortega Enrico Serra Massimo Tarallo |
| Affiliation: | Departamento de Matemática Aplicada, Facultad de Ciencias, Universidad deGranada, 18071 Granada, Spain ; Dipartimento di Matematica del Politecnico, Corso Duca degli Abruzzi 24, 10129 Torino, Italy ; Dipartimento di Matematica dell'Università, Via Saldini 50, 20133 Milano, Italy |
| Abstract: | A well known theorem says that the forced pendulum equation has periodic solutions if there is no friction and the external force has mean value zero. In this paper we show that this result cannot be extended to the case of linear friction. |
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