The period functions' higher order derivatives

Details The period functions' higher order derivatives The period functions' higher order derivatives

2012-02-10

arxiv.org/abs/1202.2235v1

Mathematics

Classical Analysis and ODEs

2 figures

Scientific paper

We prove a formula for the $n$-th derivative of the period function $T$ in a period annulus of a planar differential system. For $n = 1$, we obtain Freire, Gasull and Guillamon formula for the period's first derivative \cite{FGG}. We apply such a result to hamiltonian systems with separable variables and other systems. We give some sufficient conditions for the period function of conservative second order O.D.E.'s to be convex.

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