Skip to main content
Log in

Bernstein–Doetsch Type Theorems with Tabor Type Error Terms for Set-Valued Maps

  • Published:
Set-Valued and Variational Analysis Aims and scope Submit manuscript

Abstract

In this paper, we investigate set-valued maps of strongly and approximately Jensen convex and Jensen concave type. We present counterparts of the Bernstein–Doetsch Theorem with Tabor type error terms.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Similar content being viewed by others

References

  1. Averna, A., Cardinali, T.: On the concepts of K-convexity [K-concavity] and K-convexity [K-concavity ]. Riv. Mat. Univ. Parma 4 16(1–2), 311–330 (1990)

    MathSciNet  MATH  Google Scholar 

  2. Azócar, A., Giménez, J. , Nikodem, K., Sánchez, J.L.: On strongly midconvex functions. Opuscula Math 31(1), 15–26 (2011)

  3. Bernstein, F., Doetsch, G.: Zur Theorie der konvexen Funktionen. Math. Ann. 76(4), 514–526 (1915)

    Article  MathSciNet  MATH  Google Scholar 

  4. Boros, Z.: An inequality for the Takagi function. Math. Inequal. Appl. 11(4), 757–765 (2008)

    MathSciNet  MATH  Google Scholar 

  5. Cardinali, T., Nikodem, K., Papalini, F.: Some results on stability and on characterization of K-convexity of set-valued functions. Ann. Polon. Math. 58(2), 185–192 (1993)

    MathSciNet  MATH  Google Scholar 

  6. González, C., Nikodem, K., Páles, Zs., Roa, G.: Bernstein-Doetsch type theorems for set-valued maps of strongly and approximately convex and concave type. Publ. Math. Debrecen 84(1–2), 229–252 (2014)

    Article  MathSciNet  MATH  Google Scholar 

  7. Házy, A.: On approximate t-convexity. Math. Inequal. Appl. 8(3), 389–402 (2005)

    MathSciNet  MATH  Google Scholar 

  8. Házy, A.: On the stability of t-convex functions. Aequationes Math. 74(3), 210–218 (2007)

    Article  MathSciNet  MATH  Google Scholar 

  9. Házy, A., Páles, Zs.: On approximately midconvex functions. Bull. London Math. Soc. 36(3), 339–350 (2004)

    Article  MathSciNet  MATH  Google Scholar 

  10. Házy, A., Páles, Zs.: On approximately t-convex functions. Publ. Math. Debrecen 66(3–4), 489–501 (2005)

    MathSciNet  MATH  Google Scholar 

  11. Házy, A., Páles, Zs.: On a certain stability of the Hermite-Hadamard inequality. Proc. R. Soc. Lond. Ser. A Math. Phys. Eng. Sci. 465(2102), 571–583 (2009)

    Article  MathSciNet  MATH  Google Scholar 

  12. Laczkovich, M.: The local stability of convexity, affinity and of the Jensen equation. Aequationes Math. 58, 135–142 (1999)

    Article  MathSciNet  MATH  Google Scholar 

  13. Leiva, H., Merentes, N., Nikodem, K., Sánchez, J.L.: Strongly convex set-valued maps. J. Global Optim. 57, 695–705 (2013)

    Article  MathSciNet  MATH  Google Scholar 

  14. Makó, J., Páles, Zs.: Approximate convexity of Takagi type functions. J. Math. Anal. Appl. 369(2), 545–554 (2010)

    Article  MathSciNet  MATH  Google Scholar 

  15. Makó, J., Páles, Zs.: Implications between approximate convexity properties and approximate Hermite-Hadamard inequalities. Cent. Eur. J. Math. 10(3), 1017–1041 (2012)

    Article  MathSciNet  MATH  Google Scholar 

  16. Makó, J., Páles, Zs.: Korovkin type theorems and approximate Hermite-Hadamard inequalities. J. Approx. Theory 164(8), 1111–1142 (2012)

    Article  MathSciNet  MATH  Google Scholar 

  17. Makó, J., Páles, Zs.: On approximately convex Takagi type functions. Proc. Amer. Math. Soc. 141(6), 2069–2080 (2013)

    Article  MathSciNet  MATH  Google Scholar 

  18. Mureńko, A., Tabor, J., Tabor, J.: Applications of de Rham Theorem in approximate midconvexity. J. Diff. Equat. Appl. 18(3), 335–344 (2012)

    Article  MathSciNet  MATH  Google Scholar 

  19. Ng, C.T., Nikodem, K.: On approximately convex functions. Proc. Amer. Math. Soc. 118(1), 103–108 (1993)

    Article  MathSciNet  MATH  Google Scholar 

  20. Nikodem, K.: Continuity of K-convex set-valued functions. Bull. Polish Acad. Sci. Math. 34(7–8), 393–400 (1986)

    MathSciNet  MATH  Google Scholar 

  21. Nikodem, K.: On concave and midpoint concave set-valued functions. Glas. Mat. Ser. III 22(42)(1), 69–76 (1987)

    MathSciNet  MATH  Google Scholar 

  22. Nikodem, K.: On midpoint convex set-valued functions. Aequationes Math. 33 (1), 46–56 (1987)

    Article  MathSciNet  MATH  Google Scholar 

  23. Nikodem, K.: K-convex and K-concave set-valued functions. Zeszyty Nauk. Politech. (Łódz) Mat. 559, 1–75 (1989). (Rozprawy Nauk. 114)

  24. Papalini, F.: The K-midpoint convexity [concavity] and lower [upper] K-semicontinuity of a multifunction. Riv. Mat. Univ. Parma 4 16(1–2), 149–159 (1990)

    MathSciNet  MATH  Google Scholar 

  25. Tabor, J., Tabor, J.: Generalized approximate midconvexity. Control Cybernet 38(3), 655–669 (2009)

  26. Tabor, J., Tabor, J.: Takagi functions and approximate midconvexity. Appl. J. Math. Anal 356(2), 729–737 (2009)

  27. Tabor, J., Tabor, J., Żołdak, M.: Approximately convex functions on topological vector spaces. Publ. Math. Debrecen 77, 115–123 (2010)

  28. Tabor, J., Tabor, J., Żołdak, M.: Optimality estimations for approximately midconvex functions. Aequationes Math. 80, 227–237 (2010)

  29. Trudzik, L.I.: Continuity properties of vector-valued convex functions. J. Austral. Math. Soc. Ser. A 36(3), 404–415 (1984)

    Article  MathSciNet  MATH  Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Zsolt Páles.

Additional information

This research was supported by the Hungarian Scientific Research Fund (OTKA) Grant K 111651.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Gilányi, A., González, C., Nikodem, K. et al. Bernstein–Doetsch Type Theorems with Tabor Type Error Terms for Set-Valued Maps. Set-Valued Var. Anal 25, 441–462 (2017). https://doi.org/10.1007/s11228-016-0390-7

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s11228-016-0390-7

Keywords

Mathematics Subject Classification (2010)

Navigation