Abstract
In this paper, we extend the classical Korovkin theorems to the framework of comonotone additive, sublinear, and monotone operators. Based on the theory of Choquet capacities, several concrete examples illustrating our results are also discussed.
Similar content being viewed by others
References
Adams, D.R.: Choquet integrals in potential theory. Publ. Math. 42, 3–66 (1998)
Altomare, F.: Korovkin-type theorems and positive operators. Surv. Approx. Theory 6, 92–164 (2010)
Altomare, F., Campiti, M.: Korovkin-Type Approximation Theory and Its Applications. de Gruyter Studies in Mathematics, vol. 17. de Gruyter, Berlin (1994). (reprinted 2011)
Bauer, H.: Theorems of Korovkin type for adapted spaces. Annales de l’institut Fourier 23(4), 245–260 (1973)
Cerreira-Vioglio, S., Maccheroni, F., Marinacci, M., Montrucchio, L.: Signed integral representations of comonotonic additive functionals. J. Math. Anal. Appl. 385, 895–912 (2012)
Choquet, G.: Theory of capacities. Annales de l’ Institut Fourier 5, 131–295 (1954)
Choquet, G.: La naissance de la théorie des capacités: réflexion sur une expérience personnelle. Comptes rendus de l’Académie des sciences, Série générale, La Vie des sciences 3, 385–397 (1986)
Denneberg, D.: Non-Additive Measure and Integral. Kluwer Academic Publisher, Dordrecht (1994)
Föllmer, H., Schied, A.: Stochastic Finance, Fourth revised and extended edn. De Gruyter, Berlin (2016)
Dellacherie, C.: Quelques commentaires sur les prolongements de capacités Séminaire Probabilités V, Strasbourg, Lecture Notes in Mathematics, vol. 191. Springer, Berlin (1970)
Gal, S.G.: Uniform and pointwise quantitative approximation by Kantorovich-Choquet type integral operators with respect to monotone and submodular set functions. Mediterr. J. Math. 14, 205–216 (2017)
Gal, S.G.: Quantitative approximation by Stancu-Durrmeyer-Choquet-Šipoš operators. Math. Slovaca 69(3), 625–638 (2019)
Gal, S.G., Niculescu, C.P.: Kantorovich’s mass transport problem for capacities. Proc. Rom. Acad. Ser. A Math. Phys. Tech. Sci. Inf. Sci. 20, 6 (2019)
Gal, S.G., Opris, B.D.: Uniform and pointwise convergence of Bernstein-Durrmeyer operators with respect to monotone and submodular set functions. J. Math. Anal. Appl. 424, 1374–1379 (2015)
Gal, S.G., Trifa, S.: Quantitative estimates in uniform and pointwise approximation by Bernstein-Durrmeyer-Choquet operators. Carpath. J. Math. 33, 49–58 (2017)
Grabisch, M.: Set Functions. Games and Capacities in Decision Making. Springer, Berlin (2016)
Grossman, M.V.: Note on a generalized Bohman-Korovkin theorem. J. Math. Anal. Appl. 45, 43–46 (1974)
Korovkin, P.P.: On convergence of linear positive operators in the space of continuous functions (Russian). Doklady Akad. Nauk. SSSR (NS) 90, 961–964 (1953)
Korovkin, P.P.: Linear Operators and Approximation Theory. Hindustan Publ. Corp, Delhi (1960)
Niculescu, C.P.: Absolute continuity in Banach space theory. Rev. Roum. Math. Pures Appl. 24, 413–423 (1979)
Niculescu, C.P.: An overview of absolute continuity and its applications. Int. Ser. Numer. Math 157, 201–214 (2009)
Schaefer, H.H.: Banach Lattices and Positive Operators. Springer, Berlin (1974)
Schempp, W.: A note on Korovkin test families. Arch. Math. (Basel) 23, 521–524 (1972)
Shafer, G.: Allocations of probability. Ann. Probab. 7(5), 827–839 (1979)
Volkov, V.I.: On the convergence of sequences of linear positive operators in the space of continuous functions of two variables (Russian). Dokl. Akad. Nauk. SSSR (N.S.) 115, 17–19 (1957)
Wang, Z., Klir, G.J.: Generalized Measure Theory. Springer, New York (2009)
Wang, Z., Yan, J.-A.: A Selective Overview of Applications of Choquet Integrals. Advanced Lectures in Mathematics, pp. 484–515. Higher Educational Press, Beijing (2007)
Zhou, L.: Integral representation of continuous comonotonically additive functionals. Trans. Am. Math. Soc. 350, 1811–1822 (1998)
Author information
Authors and Affiliations
Corresponding author
Additional information
Dedicated to Professor Nicolae Dinculeanu, on the occasion of his 95th birthday.
Publisher's Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
About this article
Cite this article
Gal, S.G., Niculescu, C.P. A Nonlinear Extension of Korovkin’s Theorem. Mediterr. J. Math. 17, 145 (2020). https://doi.org/10.1007/s00009-020-01583-7
Received:
Accepted:
Published:
DOI: https://doi.org/10.1007/s00009-020-01583-7