For a class of multivalued contractions with nonclosed, nonconvex values, the set of all fixed points is proved to be nonempty and arcwise connected. Two applications are then developed. In particular, one of them is concerned with some properties of the set of all classical trajectories corresponding to continuous controls for a given nonlinear control system.
Si studia una classe di contrazioni multivoche con valori non necessariamente chiusi né convessi e si dimostra che l'insieme dei punti fissi non è vuoto ed è connesso per archi. Del risultato si fanno due applicazioni una delle quali riguarda la struttura dell'insieme delle traiettorie in senso classico corrispondenti a controlli continui di un sistema di controllo non lineare.
@article{RLIN_1994_9_5_3_203_0, author = {Salvatore A. Marano}, title = {Fixed points of multivalued contractions with nonclosed, nonconvex values}, journal = {Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni}, volume = {5}, year = {1994}, pages = {203-212}, zbl = {0862.54040}, mrnumber = {1298263}, language = {en}, url = {http://dml.mathdoc.fr/item/RLIN_1994_9_5_3_203_0} }
Marano, Salvatore A. Fixed points of multivalued contractions with nonclosed, nonconvex values. Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni, Tome 5 (1994) pp. 203-212. http://gdmltest.u-ga.fr/item/RLIN_1994_9_5_3_203_0/
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