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首页Picard定理下的全纯函数共享小函数唯一性
本文主要探讨了1907年发表在《重庆大学(英文版)》数学与应用期刊上的"Entire Functions Sharing One Small Function"。论文由李云彤和曹耀两位作者撰写,他们在文章中研究了整函数共享小函数的独特性问题。整函数是复分析中的重要概念,它们在整个复平面上连续且可微,具有丰富的性质。 在论文中,作者利用Picard定理作为核心工具,针对两个超越整函数f(z)和g(z),当共享一个小函数a(z)(a(z)不恒等于零),并且满足对于某个正整数n(至少为9),n(z)(f(z)-1)f'(z)与gn(z)(g(z)-1)g'(z)在a(z)上具有相同的重数(即考虑多重计数),他们证明了一个关键结果:如果这些条件成立,那么g(z)必须等于f(z)。这一发现是对Fang和Hong于2001年在《印度纯粹与应用数学杂志》上提出的相似定理的扩展,该定理关注的是与微分多项式相关的整函数的唯一性。 关键词包括“整函数”、“独特性”以及“微分方程”,表明研究内容深入到这两个数学领域的交叉点。整函数的独特性问题不仅涉及到函数本身的性质,还与它们的导数以及与特定小函数的关系紧密相连。这篇论文对理论数学家和研究者来说,提供了关于共享小函数条件下整函数之间关系的新见解,对于进一步探讨复分析中的不动点理论、函数类的结构以及相关动态系统具有重要的理论价值。通过深入理解这样的结果,可以推动整个领域的发展和深化对复杂函数行为的理解。
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Journal of Chongqing University: English Edition
Mathematics & Application
Vol. 6 No. 4
December 2007
Article ID: 1671-8224(2007)04-0283-04
To cite this article: LI Yun-tong, CAO Yao. Entire functions sharing one small function [J]. J Chongqing Univ: Eng Ed (ISSN 1671-8224), 2007, 6(4): 283-286.
Entire functions sharing one small function
∗
LI Yun-tong
a
, CAO Yao
Department of Mathematics, Chongqing University, Chongqing 400030, China
Received 30 December 2006; revised 27 May 2007
Abstract: The uniqueness problem of entire functions sharing one small function was studied. By Picard’s Theorem, we
proved that for two transcendental entire functions f
(z) and g(z), a positive integer n≥9, and a(z) (not identically eaqual to
zero) being a common small function related to f
(z) and g(z), if f
n
(z)(f(z)-1)f′(z) and g
n
(z)(g(z)-1)g′(z) share a(z) CM,
where CM is counting multiplicity, then g(z) ≡ f
(z). This is an extended version of Fang and Hong’s theorem [ Fang ML, Hong
W, A unicity theorem for entire functions concerning differential polynomials, Journal of Indian Pure Applied Mathematics,
2001, 32 (9): 1343-1348].
Keywords: entire function; uniqueness; differential polynomial
CLC number: O174.5 Document code: A
1 Introduction
a
Let ( )
f
z be a non-constant meromorphic function
in the whole complex plane. We use the standard
notations of value distribution theory [1] including
(, ),Trf (, ),mr f (, ),Nrf
(, ),Nrf etc., and define
(, )Srf by (, ) {(, )}Srf Tr f=
as ,r →+∞ possibly
outside a set with finite measure.
Let ( )az be a meromorphic function. If
(, ) (, )Tra Srf= , then ( )az is called a small function
related to ( )
f
z .
Let a be a finite complex number. We denote by
2)
1
(, )Nr
f
a−
the counting function for zeros of
()
f
za− with multiplicity not more than 2, and by
2)
1
(, )Nr
f
a−
the corresponding function for those
whose multiplicities are not counted. Let
(2
1
(, )Nr
f
a−
be the counting function for zeros of
a
LI Yun-tong(李运通): Male; Born 1982; Postgraduate;
Research interest: complex analysis;
E-mail: liyuntong2005@sohu.com.
*
Funded by The National Natural Science Foundation of China
under Grant No. 10671067.
()
f
za
−
with multiplicity at least 2 and
(2
(,Nr
1
)
f
a
−
the corresponding function for those whose
multiplicities are not counted. Set
2
1
(, )Nr
f
a
=
−
(2
11
(, ) (, )Nr N r
f
afa
+
−
−
.
Let ( )
g
z be a meromorphic function, and ( )az a
common small function related to ( )
f
z and ( )
g
z . If
() ()
f
zaz
−
and ( ) ( )
g
zaz
−
assume the same zeros
with the same multiplicities, then we call that ( )
f
z
and ( )
g
z share the small function ( )az CM, where
CM is counting multiplicity.
Fang and Hua [2-3] proved the following results.
Theorem A [2]. Let ( )
f
z and ( )
g
z be two
transcendental entire functions, and
6n ≥ be a
positive integer. If
() ()
n
f
zf z
′
and () ()
n
g
zg z
′
share
1 CM, then either
1
nn
ffgg
′′
≡
or
g
cf≡ for a
constant
c
with
1
1
n
c
+
=
.
Theorem B [3]. Let ( )
f
z and ( )
g
z be two
transcendental entire functions, and
6n ≥
be a
positive integer. Assume that
()( 0)az ≡ is a common
small function related to ( )
f
z and ( ).
g
z If
() ()
n
f
zf z
′
and () ()
n
g
zg z
′
share ( )az CM, then for
a constant
c with
1
1,
n
c
+
=
either
2
[()]
nn
f
fg g a z
′′
≡
or
g
cf
≡
.
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