Uniqueness and value-sharing of meromorphic functions

Uniqueness and value-sharing of meromorphic functions
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DOI:
10.1016/j.camwa.2006.08.045
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发表时间:
2007-04
期刊:
Comput. Math. Appl.
影响因子:
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通讯作者:
S. Bhoosnurmath;R. S. Dyavanal
S. Bhoosnurmath;R. S. Dyavanal
中科院分区:
其他
文献类型:
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作者:
S. Bhoosnurmath;R. S. Dyavanal

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本文研究了亚纯函数的唯一性,证明了如下定理:设f(z),g(z)是两个非常数亚纯函数,n,k是两个正整数,n> 3 k +8.如果[公式:见正文]和[公式:见正文]共享1 CM,则f(z)= c1 ecz,g(z)= c2 e −cz,其中c1,c2和c是满足[公式:见正文]的三个常数,或者f(z)=tg(z)对于常数t使得tn=1。我们的结果改进了方[M. L. Fang,Uniform and value-sharing of whole functions,Comput. Math.Appl.44(2002)823-831。[7]][1]方明良,洪伟,微分多项式整函数的唯一性定理,数学应用学报,32(9)(2001),1343-1348. [8]]林毅夫(Lin and Yi)C. Lin,H.-李文,等.亚纯函数的唯一性定理.应用数学学报,2004,(1):121-132. [9]]。
In this paper, we study the uniqueness of meromorphic functions and prove the following theorem: Let f(z) and g(z) be two non-constant meromorphic functions, n,k two positive integers with n>3k+8. If [Formula: see text] and [Formula: see text] share 1 CM, then either f(z)=c1ecz,g(z)=c2e−cz, where c1,c2and c are three constants satisfying [Formula: see text] or f(z)=tg(z) for a constant t such that tn=1. Our results improves the results of Fang [M.L. Fang, Uniqueness and value-sharing of entire functions, Comput. Math. Appl. 44 (2002) 823–831. [7]], Fang and Hong [M.L. Fang, W. Hong, A unicity theorem for entire functions concerning differential polynomials, Indian J. Pure Appl. Math. 32 (9) (2001) 1343–1348. [8]] and Lin and Yi [W.-C. Lin, H.-X. Yi, Uniqueness theorems for meromorphic function, Indian J. Pure Appl. Math. 32 (9) (2004) 121–132. [9]].