ArticleOriginal scientific text
Title
On some generalized invariant means and their application to the stability of the Hyers-Ulam type
Authors 1
Affiliations
- Institute of Mathematics, Silesian University, Bankowa 14, 40-007 Katowice, Poland
Abstract
We present some extension of the concept of an invariant mean to a space of vector-valued mappings defined on a semigroup. Next, we apply it to the study of the stability of some functional equation.
Keywords
Hyers-Ulam stability theorem, invariant mean, binary intersection property
Bibliography
- M. A. Albert and J. A. Baker, Functions with bounded n-th differences, Ann. Polon. Math. 43 (1983), 93-103.
- K. Baron, Functions with differences in subspaces, in: Proceedings of the 18th International Symposium on Functional Equations, University of Waterloo, Faculty of Mathematics, Waterloo, Ontario, Canada, 1980.
- M. M. Day, Amenable semigroups, Illinois J. Math. 1 (1957), 509-544.
- M. M. Day, Fixed point theorem for compact convex sets, ibid. 5 (1961), 585-590.
- M. M. Day, Normed Linear Spaces, Springer, Berlin 1973.
- J. Dixmier, Les moyennes invariantes dans les semigroupes et leurs applications, Acta Sci. Math. (Szeged) 12 (1950), 213-227.
- G. L. Forti and J. Schwaiger, Stability of homomorphisms and completeness, C. R. Math. Rep. Acad. Sci. Canada 11 (6) (1989), 215-220.
- Z. Gajda, A solution to a problem of J. Schwaiger, Aequationes Math. 32 (1987), 38-44.
- Z. Gajda, Invariant means and representations of semigroups in the theory of functional equations, Prace Naukowe Uniwersytetu Śląskiego 1273, Katowice 1992.
- Z. Gajda, W. Smajdor and A. Smajdor, A theorem of the Hahn-Banach type and its applications, Ann. Polon. Math. 57 (1992), 243-252.
- F. P. Greenleaf, Invariant Means on Topological Groups and Their Applications, Van Nostrand Math. Stud. 16, New York 1969.
- E. Hewitt and K. A. Ross, Abstract Harmonic Analysis, Vol. I, Springer, Berlin 1963.
- D. H. Hyers, On the stability of the linear functional equations, Proc. Nat. Acad. Sci. U.S.A. 27 (1941), 222-224.
- M. Kuczma, An Introduction to the Theory of Functional Equations and Inequalities, Polish Scientific Publishers (PWN) and Silesian University Press, Warszawa-Kraków-Katowice 1985.
- Z. Moszner, Sur la stabilité de l'équation d'homomorphisme, Aequationes Math. 29 (1985), 290-306.
- L. Nachbin, A theorem of the Hahn-Banach type for linear transformations, Trans. Amer. Math. Soc. 68 (1950), 28-46.
- J. von Neumann, Zur allgemeinen Theorie der Masses, Fund. Math. 13 (1929), 73-116.
- K. Nikodem, On Jensen's functional equation for set-valued functions, Rad. Mat. 3 (1987), 23-33.
- J. Rätz, On approximately additive mappings, in: General Inequalities 2, Internat. Ser. Numer. Math. 47, Birkhäuser, Basel 1980, 233-251.
- L. Székelyhidi, Remark 17, Report of Meeting, Aequationes Math. 29 (1985), 95-96.
- L. Székelyhidi, Note on Hyers's theorem, C. R. Math. Rep. Acad. Sci. Canada 8 (1986), 127-129.
- S. M. Ulam, Problems in Modern Mathematics, Science Editions, Wiley, New York 1960.