賈志晶, 葉亞盛
(上海理工大學(xué)理學(xué)院,上海 200093)
分擔(dān)依賴于函數(shù)的常數(shù)亞純函數(shù)正規(guī)族
賈志晶, 葉亞盛
(上海理工大學(xué)理學(xué)院,上海 200093)
研究關(guān)于分擔(dān)值的亞純函數(shù)族的正規(guī)性,證明了如下結(jié)果:設(shè)k,n(≥k+3)是兩個(gè)正整數(shù),F(xiàn)為單位圓盤Δ內(nèi)的一族亞純函數(shù),如果對于每一個(gè)f∈F,f的零點(diǎn)重級≥k,且存在僅依賴于f的非零有窮復(fù)數(shù)bf,cf滿足是一個(gè)常數(shù);0;對于每一對f,g∈F,有,這里m>,那么F在Δ內(nèi)正規(guī).
亞純函數(shù);全純函數(shù);正規(guī)族;分擔(dān)值
在證明定理之前,需要如下幾個(gè)引理:
引理1[16]設(shè)p,q是兩個(gè)正整數(shù),α是一個(gè)實(shí)數(shù)且滿足-q<α<p,F(xiàn)為單位圓盤Δ內(nèi)的一族亞純函數(shù),如果對于每一個(gè)f∈F,f的零點(diǎn)重級≥p,且f的極點(diǎn)重級≥q.如果F在z0∈Δ處不正規(guī),那
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(編輯:丁紅藝)
Normal Families of Meromorphic Functions Concerning Sharing Constants Depending on Function
JIA Zhijing, YEYasheng
(College of Science,University of Shanghai for Science and Technology,Shanghai 200093,China)
Let k and n(≥k+3)be two positive integers,and F be a family of meromorphic functions in unit diskΔ.If for each function f∈F,all zeros of f have multiplicity k at least,and there exist nonzero finite complex numbers bf,cfdepending on f satisfying:bfis a constant; min{σ(0,bf),σ(0,cf),σ(bf,cf)}≥m,for some m>0;for each f,g∈F.Then F is normal inΔ.
meromorphic functions;holomorphic fu nctions;normal family;shared value
O 174.52
A
1007-6735(2015)02-0136-04
10.13255/j.cnki.ju sst.2015.02.007
2013-12-17
國家自然科學(xué)基金資助項(xiàng)目(11371139)
賈志晶(1990-),女,碩士研究生.研究方向:復(fù)分析.E-mail:jiazhijing08@163.com通信作者:葉亞盛(1960-),男,副教授.研究方向:復(fù)分析.E-mail:yashengye@aliyun.com