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Normality and shared values concerning differential polynomial

Normality and shared values concerning differential polynomial Let ℱℱ be a family of meromorphic functions in a domain D ; let k ≥≥ 2 be a positive integer; and let a, b and c be complex numbers such that b ≠≠ 0 and a ≠≠ c . If, for each ƒƒ ∈∈ ℱℱ, all zeros of ƒƒ have multiplicity at least k , ƒƒ( z ) == a ⇔⇔ D (ƒƒ) == b , and D (ƒƒ) == 0 ⇒⇒ ƒƒ( z ) == c , where D (ƒƒ) is the differential polynomial of ƒƒ( z ), then ℱℱ is normal in D . http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Georgian Mathematical Journal de Gruyter

Normality and shared values concerning differential polynomial

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References (9)

Publisher
de Gruyter
Copyright
©© de Gruyter 2011
ISSN
1072-947X
eISSN
1072-9176
DOI
10.1515/gmj.2011.0020
Publisher site
See Article on Publisher Site

Abstract

Let ℱℱ be a family of meromorphic functions in a domain D ; let k ≥≥ 2 be a positive integer; and let a, b and c be complex numbers such that b ≠≠ 0 and a ≠≠ c . If, for each ƒƒ ∈∈ ℱℱ, all zeros of ƒƒ have multiplicity at least k , ƒƒ( z ) == a ⇔⇔ D (ƒƒ) == b , and D (ƒƒ) == 0 ⇒⇒ ƒƒ( z ) == c , where D (ƒƒ) is the differential polynomial of ƒƒ( z ), then ℱℱ is normal in D .

Journal

Georgian Mathematical Journalde Gruyter

Published: Jun 1, 2011

Keywords: Normal families; meromorphic functions; shared values

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