Abstract
The aim of this paper is twofold. Firstly, we study the non-existence of finite order meromorphic solutions to the Cubic type of Fermat functional equation \(f(z)^3-3\tau f(z)f(z+c)+f(z+c)^3=1\). In addition, the paper is concerned with the description of finite order entire solutions of the Quadratic type of Fermat functional equation \(f(z)^2-2\mu f(z)f(z+c)+f(z+c)^2=1\).
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References
Baker, I.N.: On a class of meromorphic functions. Proc. Am. Math. Soc. 17, 819–822 (1966)
Bank, S.B., Langley, J.K.: On the value distribution theory of elliptic functions. Monatsh. Math. 98, 1–20 (1984)
Bergweiler, W.: Order and lower order of composite meromorphic functions. Mich. Math. J. 36, 135–146 (1989)
Chen, W., Han, Q., Liu, J.B.: On Fermat Diophantine functional equations, little Picard theorem and beyond. Aequ. Math. 93, 425–432 (2019)
Edrei, A., Fuchs, W.H.J.: On the zeros of \(f(g(z))\) where \(f\) and \(g\) are entire functions. J. Anal. Math. 12, 243–255 (1964)
Gross, F.: On the equation \(f^{n}+g^{n} = 1\). Bull. Am. Math. Soc. 72, 86–88 (1966)
Gross, F.: On the equation \(f^{n} + g^{n} = h^{n}\). Am. Math. Mon. 73, 1093–1096 (1966)
Hayman, W.K.: Meromorphic Functions. Clarendon Press, Oxford (1964)
Heittokangas, J., Korhonen, R., Laine, I., Rieppo, J.: Uniqueness of meromorphic functions sharing values with their shifts. Complex Var. Elliptic Equ. 56, 81–92 (2011)
Hu, P.C., Wang, Q.: On meromorphic solutions of functional equations of Fermat type. Bull. Malays. Math. Sci. Soc. 42, 2497–2515 (2019)
Laine, I.: Nevanlinna Theory and Complex Differential Equations. de Gruyter, Berlin (1993)
Li, B.Q.: Entire solutions of certain partial differential equations and factorization of partial derivatives. Trans. Am. Math. Soc. 357, 3169–3177 (2005)
Li, B.Q.: On certain functional and partial differential equations. Forum Math. 17, 77–86 (2005)
Li, B.Q.: On meromorphic solutions of \(f^2 + g^2 = 1\). Math. Z. 258, 763–771 (2008)
Li, B.Q.: On meromorphic solutions of generalized Fermat equations. Int. J. Math. 25(1), 1450002 (2014)
Liu, K., Cao, T.B., Cao, H.Z.: Entire solutions of Fermat type differential-difference equations. Arch. Math. 99, 147–155 (2012)
Liu, K., Yang, L.Z.: On entire solutions of some differential-difference equations. Comput. Methods Funct. Theory 13, 433–447 (2013)
Lü, F., Han, Q.: On the Fermat-type equation \(f^{3}(z)+f^{3}(z+c)=1\). Aequ. Math. 91, 129–136 (2017)
Montel, P.: Le.cons sur les familles normales de fonctions analytiques et leurs applications, pp. 135–136. Gauthier-Villars, Paris (1927)
Saleeby, E.G.: On complex analytic solutions of certain trinomial functional and partial differential equations. Aequ. Math. 85, 553–562 (2013)
Yang, C.C., Yi, H.X.: Uniqueness Theory of Meromorphic Functions. Science Press, Beijing (2003)
Acknowledgements
The authors would like to thank the referee for his/her helpful suggestions. The research was supported by NNSF of China Project (11601521) and the Fundamental Research Fund for Central Universities in China Project (18CX02048A & 18CX02045A & 17CX02049 & YCX2019093).
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Wu, L., He, C., Lü, W. et al. Existence of meromorphic solutions of some generalized Fermat functional equations. Aequat. Math. 94, 59–69 (2020). https://doi.org/10.1007/s00010-019-00683-4
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DOI: https://doi.org/10.1007/s00010-019-00683-4