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A Nonlinear Extension of Korovkin’s Theorem

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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.

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References

  1. Adams, D.R.: Choquet integrals in potential theory. Publ. Math. 42, 3–66 (1998)

    Article  MathSciNet  Google Scholar 

  2. Altomare, F.: Korovkin-type theorems and positive operators. Surv. Approx. Theory 6, 92–164 (2010)

    MATH  Google Scholar 

  3. Altomare, F., Campiti, M.: Korovkin-Type Approximation Theory and Its Applications. de Gruyter Studies in Mathematics, vol. 17. de Gruyter, Berlin (1994). (reprinted 2011)

    Book  Google Scholar 

  4. Bauer, H.: Theorems of Korovkin type for adapted spaces. Annales de l’institut Fourier 23(4), 245–260 (1973)

    Article  MathSciNet  Google Scholar 

  5. Cerreira-Vioglio, S., Maccheroni, F., Marinacci, M., Montrucchio, L.: Signed integral representations of comonotonic additive functionals. J. Math. Anal. Appl. 385, 895–912 (2012)

    Article  MathSciNet  Google Scholar 

  6. Choquet, G.: Theory of capacities. Annales de l’ Institut Fourier 5, 131–295 (1954)

    Article  MathSciNet  Google Scholar 

  7. 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)

    MathSciNet  MATH  Google Scholar 

  8. Denneberg, D.: Non-Additive Measure and Integral. Kluwer Academic Publisher, Dordrecht (1994)

    Book  Google Scholar 

  9. Föllmer, H., Schied, A.: Stochastic Finance, Fourth revised and extended edn. De Gruyter, Berlin (2016)

    Book  Google Scholar 

  10. Dellacherie, C.: Quelques commentaires sur les prolongements de capacités Séminaire Probabilités V, Strasbourg, Lecture Notes in Mathematics, vol. 191. Springer, Berlin (1970)

    Google Scholar 

  11. 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)

    Article  MathSciNet  Google Scholar 

  12. Gal, S.G.: Quantitative approximation by Stancu-Durrmeyer-Choquet-Šipoš operators. Math. Slovaca 69(3), 625–638 (2019)

    Article  MathSciNet  Google Scholar 

  13. 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)

    MathSciNet  MATH  Google Scholar 

  14. 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)

    Article  MathSciNet  Google Scholar 

  15. Gal, S.G., Trifa, S.: Quantitative estimates in uniform and pointwise approximation by Bernstein-Durrmeyer-Choquet operators. Carpath. J. Math. 33, 49–58 (2017)

    MathSciNet  MATH  Google Scholar 

  16. Grabisch, M.: Set Functions. Games and Capacities in Decision Making. Springer, Berlin (2016)

    Book  Google Scholar 

  17. Grossman, M.V.: Note on a generalized Bohman-Korovkin theorem. J. Math. Anal. Appl. 45, 43–46 (1974)

    Article  MathSciNet  Google Scholar 

  18. 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)

    Google Scholar 

  19. Korovkin, P.P.: Linear Operators and Approximation Theory. Hindustan Publ. Corp, Delhi (1960)

    Google Scholar 

  20. Niculescu, C.P.: Absolute continuity in Banach space theory. Rev. Roum. Math. Pures Appl. 24, 413–423 (1979)

    MathSciNet  MATH  Google Scholar 

  21. Niculescu, C.P.: An overview of absolute continuity and its applications. Int. Ser. Numer. Math 157, 201–214 (2009)

    Article  MathSciNet  Google Scholar 

  22. Schaefer, H.H.: Banach Lattices and Positive Operators. Springer, Berlin (1974)

    Book  Google Scholar 

  23. Schempp, W.: A note on Korovkin test families. Arch. Math. (Basel) 23, 521–524 (1972)

    Article  MathSciNet  Google Scholar 

  24. Shafer, G.: Allocations of probability. Ann. Probab. 7(5), 827–839 (1979)

    Article  MathSciNet  Google Scholar 

  25. 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)

    MathSciNet  MATH  Google Scholar 

  26. Wang, Z., Klir, G.J.: Generalized Measure Theory. Springer, New York (2009)

    Book  Google Scholar 

  27. 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)

    Google Scholar 

  28. Zhou, L.: Integral representation of continuous comonotonically additive functionals. Trans. Am. Math. Soc. 350, 1811–1822 (1998)

    Article  MathSciNet  Google Scholar 

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Correspondence to Sorin G. Gal.

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Dedicated to Professor Nicolae Dinculeanu, on the occasion of his 95th birthday.

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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

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