A Floquet-Liapunov theorem in Frechet spaces

Details A Floquet-Liapunov theorem in Frechet spaces A Floquet-Liapunov theorem in Frechet spaces

1999-01-12

arxiv.org/abs/math/9901050v1

Mathematics

Classical Analysis and ODEs

13 pages. To appear in "Ann. Scuola Norm. Sup. Pisa cl. Sci(4), Vol. XXVII (1998)

Scientific paper

In this paper we prove a variation of the theorem in title, for equations with periodic coefficients, in Frechet spaces. The main result gives equivalent conditions ensuring the reduction of such an equation to one with constant coefficient. In the particular case of $C^{\infty}$, we obtain the exact analogue of the classical theorem. Our approach essentially uses the fact that a Frechet space is the limit of a projective sequence of Banach spaces, consequently a linear differential equation in the former can be obtained as the projective limit of a system of linear equations in the latter (see also [G. Galanis, On a type of linear differential equations in Frechet spaces, Ann. Scuola Norm. Sup. Pisa, Ser. 4, 24 (1997), 501-510]). A geometric application is also discussed.

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