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Some generalizations in H-modular spaces of Fan's best approximation theorem

Published online by Cambridge University Press:  09 April 2009

Carlo Bardaro
Affiliation:
Dipartimento di Matematica, Università degli Studi di Perugia, via Pascoli, 06100 Perugia, Italy
Rita Ceppitelli
Affiliation:
Dipartimento di Mathematica e Fisica, Università di Camerino, via Venanzi 16, 62032 Camerino (MC), Italy
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Abstract

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We state best approximation and fixed point theorems in modular spaces endowed with an H-space structure given by the modular topology. We consider both the cases of single valued functions and multifunctions. These theorems extend some previous results due to Ky Fan.

Type
Research Article
Copyright
Copyright © Australian Mathematical Society 1994

References

[1]Bardaro, C. and Ceppitelli, R., ‘Minimax inequalities in Riesz spaces’, Atti. Sem. Mat. Fis. Univ. Modena 35 (1987), 6370.Google Scholar
[2]Bardaro, C. and Ceppitelli, R., ‘Some further generalizations of Knaster-Kuratowski-Mazurkiewicz Theorem and minimax inequalities’, J. Math. Anal. Appl. 132 (1988), 484490.CrossRefGoogle Scholar
[3]Bardaro, C. and Ceppitelli, R., ‘Applications of the generalized Knaster-Kuratowski-Mazurkiewicz Theorem to variational inequalities’, J. Math. Anal. Appl. 137 (1989), 4658.CrossRefGoogle Scholar
[4]Bardaro, C. and Ceppitelli, R., ‘Fixed point theorems and vector valued minimax theorems’, J. Math. Anal. Appl. 146 (1990), 363373.CrossRefGoogle Scholar
[5]Browder, F. E., ‘A new generalization of the Schauder fixed point theorem’, Math. Ann. 174 (1967), 285290.CrossRefGoogle Scholar
s[6]Castaing, C. and Valadier, M., Convex analysis and measurable multifunctions, Lecture Notes in Math. 580 (Springer, Berlin, 1977).CrossRefGoogle Scholar
[7]Chen, G. Y., ‘Generalized section theorem and minimax inequality for a vector-valued mapping’, to appear.Google Scholar
[8]Fan, K., ‘Extensions of two fixed point theorems of F. E. Browder’, Math. Z. 112 (1969), 234240.CrossRefGoogle Scholar
[9]Horvath, C. D., ‘Points fixes et coincidences dans les éspaces topologiques compacts contractiles’, C. R. Acad. Sci. Paris Sér. I Math. 299 (1984), 519521.Google Scholar
[10]Horvath, C. D., Some results on multivalued mappings and inequalities without convexity, Lecture Notes in Pure and Appl. Math. 107 (Marcel Dekker, New York, 1988).Google Scholar
[11]Horvath, C. D., ‘Contractibility and generalized convexity’, J. Math. Anal. Appl. 156 (1991), 341357.CrossRefGoogle Scholar
[12]Kozlowski, W. M., Modular function spaces (Marcel Dekker, New York, 1989).Google Scholar
[13]Lassonde, M., ‘On the use of K.K.M. multifunctions in fixed point theory and related topics’, J. Math. Anal. Appl. 97 (1983), 151201.CrossRefGoogle Scholar
[14]Musielak, J., Orlicz spaces and modular spaces, Lecture Notes in Math. 1034 (Springer, Berlin, 1983).CrossRefGoogle Scholar
[15]Sehgal, V. M. and Singh, S. P., ‘A generalization to multifunctions of Fan's best approximation theorem’, Proc. Amer. Math. Soc. 102 (1988), 534537.Google Scholar