Geodesic
Lyapunov exponents, periodic orbits, and horseshoes for semiflows on Hilbert spaces
Lian, Zeng1 ; Young, Lai-Sang1
1 Courant Institute of Mathematical Sciences, New York University, 251 Mercer Street, New York, New York 10012
Journal of the American Mathematical Society, Tome 25 (2012) no. 3, pp. 637-665

Voir la notice de l'article provenant de la source American Mathematical Society

Two settings are considered: flows on finite dimensional Riemannian manifolds, and semiflows on Hilbert spaces with conditions consistent with those in systems defined by dissipative parabolic PDEs. Under certain assumptions on Lyapunov exponents and entropy, we prove the existence of geometric structures called horseshoes; this implies in particular the presence of infinitely many periodic solutions. For diffeomorphisms of compact manifolds, analogous results are due to A. Katok. Here we extend Katok’s results to (i) continuous time and (ii) infinite dimensions.
DOI : 10.1090/S0894-0347-2012-00734-6

Lian, Zeng 1 ; Young, Lai-Sang 1

1 Courant Institute of Mathematical Sciences, New York University, 251 Mercer Street, New York, New York 10012 
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Lian, Zeng; Young, Lai-Sang. Lyapunov exponents, periodic orbits, and horseshoes for semiflows on Hilbert spaces. Journal of the American Mathematical Society, Tome 25 (2012) no. 3, pp. 637-665. doi: 10.1090/S0894-0347-2012-00734-6

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