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Unicity of mermorphic functions concerning shared functions with their difference

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In this paper, we investigate the uniqueness of meromorphic functions of finite order concerning sharing small functions and prove that if $f(z)$ and $\Delta_c f(z)$ share $a(z), b(z), \infty$ CM, where $a(z), b(z) (\not \equiv \infty)$ are two distinct small functions of $f(z)$, then $f(z)\equiv \Delta_cf(z)$. The result improves the results due to Li et al.~(\cite{LXM}), Cui et al.~(\cite{CN}) and L\"{u} et al.~(\cite{LF}).

Abstract

In this paper, we investigate the uniqueness of meromorphic functions of finite order concerning sharing small functions and prove that if $f(z)$ and $\Delta_c f(z)$ share $a(z), b(z), \infty$ CM, where $a(z), b(z) (\not \equiv \infty)$ are two distinct small functions of $f(z)$, then $f(z)\equiv \Delta_cf(z)$. The result improves the results due to Li et al.~(\cite{LXM}), Cui et al.~(\cite{CN}) and L\"{u} et al.~(\cite{LF}).

참고문헌 (17)

  1. Ning Cui, "The conjecture on unity of meromorphic functions concerning their differences", Journal of Difference Equations and Applications, 22(10), pp.1452~1471 (2016), Informa UK Limited[DOI]
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  3. Zong-Xuan Chen, "On Sharing Values of Meromorphic Functions and Their Differences", Results in Mathematics, 63(1-2), pp.557~565 (2013), Springer Science and Business Media LLC[DOI]
  4. Yik-Man Chiang, "On the Nevanlinna characteristic of f(z+η) and difference equations in the complex plane", The Ramanujan Journal, 16(1), pp.105~129 (2008), Springer Science and Business Media LLC[DOI]
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  7. W. K. Hayman, "Meromorphic Functions, Oxford Mathematical Monographs" (1964), Clarendon Press
  8. J. Heittokangas, "Value sharing results for shifts of meromorphic functions, and sufficient conditions for periodicity", Journal of Mathematical Analysis and Applications, 355(1), pp.352~363 (2009), Elsevier BV[DOI]
  9. Xiao-Min Li, "RESULTS ON MEROMORPHIC FUNCTIONS SHARING THREE VALUES WITH THEIR DIFFERENCE OPERATORS", 대한수학회보, 52(5), pp.1401~1422 (2015), 대한수학회
  10. Yuhua Li, "The uniqueness of meromorphic functions concerning small functions", Science in China Series A: Mathematics, 43(6), pp.581~590 (2000), Springer Science and Business Media LLC[DOI]
  11. D. Liu, "Unicity of entire functions concerning shifts and dierence operators", Abstr. Appl. Anal, 2014, pp.5~ (2014)[DOI]
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  13. R. Nevanlinna, "Le theoreme de Picard-Borel et la theorie des fonctions meromorphes" (1974), Chelsea Publishing Co.
  14. Chung-Chun Yang, "On deficiencies of differential polynomials, II", Mathematische Zeitschrift, 125(2), pp.107~112 (1972), Springer Science and Business Media LLC[DOI]
  15. C.-C. Yang, "Uniqueness Theory of Meromorphic Functions" (2003), Kluwer Academic Publishers Group
  16. L. Yang, "Value Distribution Theory" (1993), Springer-Verlag
  17. Jie Zhang, "Entire functions sharing some values with their difference operators", Science China Mathematics, 57(10), pp.2143~2152 (2014), Springer Science and Business Media LLC[DOI]

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