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Sharing of a set of meromorphic functions and Montel's theorem

Complex Variables 2015-09-22 v1

Abstract

In this paper we prove the result: Let F\mathcal{F} be a family of meromorphic functions on a domain Ω\Omega such that every pair of members of F\mathcal{F} shares a set S:={ψ1(z),ψ2(z),ψ3(z)}S:=\left\{\psi_1(z), \psi_2(z), \psi_3(z) \right\} in Ω\Omega, where ψj(z), j=1,2,3\psi_j(z), \ j=1,2,3 is meromorphic in Ω.\Omega. If for every fFf\in \mathcal{F}, f(z0)ψi(z0)f(z_0)\neq \psi_i (z_0) whenever ψi(z0)=ψj(z0)\psi_i(z_0)=\psi_j(z_0) for i,j{1,2,3}(ij)i,j\in \left\{1,2,3 \right\}(i\neq j) and z0Ω,z_0\in \Omega , then F\mathcal{F} is normal in Ω\Omega. This result generalizes a result of M.Fang and W.Hong [Some results on normal family of meromorphic functions, Bull. Malays. Math. Sci. Soc. (2)23 (2000),143-151,] and in particular, it generalizes the most celebrated theorem of Montel-the Montel's theorem.

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Cite

@article{arxiv.1509.06128,
  title  = {Sharing of a set of meromorphic functions and Montel's theorem},
  author = {Kuldeep Singh Charak and Virender Singh},
  journal= {arXiv preprint arXiv:1509.06128},
  year   = {2015}
}

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6 pages