Some lemmas about dynamical systems.
Mathematica Scandinavica, Tome 52 (1983), pp. 262-268.

Voir la notice de l'article provenant de la source European Digital Mathematics Library

Mots-clés : shadowing lemma, lower semicontinuous functions, chain recurrent points
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     author = {I. Ekeland},
     title = {Some lemmas about dynamical systems.},
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I. Ekeland. Some lemmas about dynamical systems.. Mathematica Scandinavica, Tome 52 (1983), pp. 262-268. http://geodesic.mathdoc.fr/item/MS2_1983__52_166843/