On autogenerating systems
P. Ferst, P. Slačálek (1977)
Acta Universitatis Carolinae. Mathematica et Physica
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P. Ferst, P. Slačálek (1977)
Acta Universitatis Carolinae. Mathematica et Physica
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A. Gasull, R. Prohens (1997)
Applicationes Mathematicae
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We take advantage of the complex structure to compute in a short way and without using any computer algebra system the Lyapunov quantities and for a general smooth planar system.
Conlon, Joseph G., Naddaf, Ali (2000)
The New York Journal of Mathematics [electronic only]
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Krapez, A. (1981)
Publications de l'Institut Mathématique. Nouvelle Série
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Radnaev, V. A. (2002)
Vladikavkazskiĭ Matematicheskiĭ Zhurnal
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Claudio Baiocchi, Fabio Gastaldi, Franco Tomarelli (1986)
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze
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Camillo Costantini (1999)
Commentationes Mathematicae Universitatis Carolinae
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Assuming Martin’s Axiom, we provide an example of two Fréchet-Urysohn -spaces, whose product is a non-Fréchet-Urysohn -space. This gives a consistent negative answer to a question raised by T. Nogura.