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Robinson, James C. and Vidal López, Alejandro
(2006)
*Minimal periods of semilinear evolution equations with Lipschitz nonlinearity.*
Journal of Differential Equations, 220
(2).
pp. 396-406.
ISSN 0022-0396

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Official URL: http://www.sciencedirect.com/science/journal/00220396

## Abstract

It is known that any periodic orbit of a Lipschitz ordinary differential equation must have period at least 2π/L, where L is the Lipschitz constant of f. In this paper, we prove a similar result for the semilinear evolution equation du/dt=-Au+f(u): for each α with 0 α 1/2 there exists a constant Kα such that if L is the Lipschitz constant of f as a map from D(Aα) into H then any periodic orbit has period at least KαL-1/(1-α). As a concrete application we recover a result of Kukavica giving a lower bound on the period for the 2d Navier–Stokes equations with periodic boundary conditions.

Item Type: | Article |
---|---|

Uncontrolled Keywords: | Period orbits; Minimal period; Semilinear evolution equations; Navier–Stokes equations |

Subjects: | Sciences > Mathematics > Differential equations |

ID Code: | 12584 |

Deposited On: | 13 Apr 2011 08:37 |

Last Modified: | 12 Dec 2018 15:07 |

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