A lemma on the difference quotients
A lemma on the difference quotients
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关于差商的引理
DOI:
10.5186/aasfm.2020.4521
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发表时间:
2018-06
期刊:
影响因子:
--
通讯作者:
Jianhua Zheng
中科院分区:
文献类型:
--
作者:
Risto Korhonen;Kazuya Tohge;Yueyang Zhang;Jianhua Zheng
Using a new Borel type growth lemma, we extend the difference analogue of the lemma on the logarithmic derivative due to Halburd and Korhonen to the case of meromorphic functions $f(z)$ such that $\log T(r,f)\leq r/(\log r)^{2+\nu}$, $\nu>0$, for all sufficiently large $r$. The method by Halburd and Korhonen implies an estimate for the lemma on difference quotients, where the exceptional set is of finite logarithmic measure. We show the necessity of this set by proving that it must be of infinite linear measure for meromorphic functions whose deficiency is dependent on the choice of the origin. In addition, we show that there is an infinite sequence of $r$ in the set for which $m(r,f(z+c)/f(z))$ is not small compared to $T(r,f)$ for entire functions constructed by Miles. We also give a discrete version of Borel type growth lemma and use it to extend Halburd's result on first order discrete equations of Malmuist type.
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DOI:
10.1515/9783110863147
发表时间:
1992-12
期刊:
--
影响因子:
--
作者:
I. Laine
通讯作者:
I. Laine
影响因子:
2.4
作者:
Bellon, MP;Viallet, CM
通讯作者:
Viallet, CM
影响因子:
0.7
作者:
C. Osgood
通讯作者:
C. Osgood
影响因子:
4.1
作者:
T. Shimizu;K. Yosida;S. Kakutani
通讯作者:
T. Shimizu;K. Yosida;S. Kakutani
影响因子:
8.6
作者:
J. Hietarinta;C. Viallet
通讯作者:
J. Hietarinta;C. Viallet