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平面上具有有界Fréchet导数的调和映照单叶半径的精确估计 被引量:4

Sharp estimate on univalent radius for planar harmonic mappings with bounded Fréchet derivative
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摘要 给定单位圆盘D={z||z|<1}上调和映照f(z)=h(z)+g(z),其中h(z)和g(z)为D上的解析函数,满足f(0)=0,λf(0)=1,ΛfΛ.通过引入复参数λ,|λ|=1,本文研究调和映照Fλ(z)=h(z)+λg(z)和解析函数Gλ(z)=h(z)+λg(z)的性质,得到Fλ(z)和Gλ(z)单叶半径的精确估计.作为应用,本文得到单位圆盘D上某些K-拟正则调和映照Bloch常数的更好估计,改进和推广由Chen等人所得的相应结果. Given harmonic mappings f(z) = h(z) + g(z) on the unit disk D = {z | |z| &lt; 1}, where h(z) and g(z) are analytic functions on the unit disk D, with f(0) = 0, λf(0) = 1 and Λf Λ, by introducing one complex parameter λ, we consider the properties for the harmonic mappings Fλ(z) = h(z) + λg(z) and analytic functions Gλ(z) = h(z) + λg(z) with |λ| = 1 and obtain the sharp estimate on univalent radius for Fλ(z) and Gλ(z). As an application, we also obtain a better estimate on Bloch constant for some K-quasiregular harmonic mappings on the unit disk D. Our results generalize and improve the one made by Chen et al.(2000).
作者 黄心中
出处 《中国科学:数学》 CSCD 北大核心 2014年第6期685-692,共8页 Scientia Sinica:Mathematica
基金 福建省自然科学基金(批准号:2011J0101) 国家青年自然科学基金(批准号:11101165)资助项目
关键词 调和映照 拟正则调和映照 单叶半径 BLOCH常数 harmonic mappings quasi-regular harmonic mappings univalent radius Bloch constant
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参考文献14

  • 1Chen H H, Gauthier P M, Hengartner W. Bloch constants for planar harmonic mappings. Proc Amer Math Soc, 2000 128:3231-3240.
  • 2Dorff M, Nowak M. Landau's theorem for planar harmonic mappings. Comput Methods Funct Theory, 2004, 4 151-158.
  • 3Grigoryan A. Landau and Bloch theorems for harmonic mappings. Complex Var Elliptic Equ, 2006, 51:81-87.
  • 4Huang X Z. Estimates on Bloch constants for planar harmonic mappings. J Math Anal Appl, 2007, 337:880-887.
  • 5Abdulhadi Z, Muhanna Y, Khuri S. On univalent solutions of the biharmonic equations. J Inequal Appl, 2005, 5 469-478.
  • 6Abdulhadi Z, Muhanna Y, Khuri S. On some properties of solutions of the biharmonic equation. Appl Math Comput 2006, 177:346-351.
  • 7Abdulhadi Z, Muhanna Y. Landau's theorem for biharmonic mappings. J Math Anal Appl, 2008, 338:705-709.
  • 8刘名生.关于平面调和映射的Bloch常数的估计[J].中国科学(A辑),2008,38(8):851-858. 被引量:1
  • 9Liu M S, Liu Z W. On Bloch constants for certain harmonic mappings. Southeast Asian Bull Math, 2013, 37:211-220.
  • 10Liu M S. Landau's theorems for biharmonic mappings. Complex Var Elliptic Equ, 2008, 53:843-855.

二级参考文献10

  • 1Lewy H. On the non-vanishing of the Jacobian in certain one-to-one mappings. Bull Amer Math Soc, 42: 689-692 (1936).
  • 2Chen H H. On the Bloch constant. In: Arakelian N, Gauthier P M, eds. Approximation, Complex Analysis, and Potential Theory. Dordrecht: KLuwer Acad Publ, 2001, 129-161.
  • 3Laudau E. Der Picard-Schottysche Satz und die Blochsche Konstanten. Sitzungsber Preuss Akad Wiss Berlin Phys.-Math Kl, 1926, 467-474.
  • 4Chen H H, Gauthier P M, Hengartner W. Bloch constants for planar harmonic mappings. Proc Amer Math Soc, 128:3231-3240 (2000).
  • 5Graham I, Kohr G. Geometric Function Theory in One and Higher Dimensions. New York: Marcel Dekker Inc, 2003.
  • 6Dorff M, Nowak M. Landau's theorem for planar harmonic mappings. Comput Meth Funet Theory, 4(1): 151-158 (2000).
  • 7Grigoryan A. Landau and Bloch theorems for harmonic mappings. Complex Variable Theory Appl, 51(1): 81-87 (2006).
  • 8Huang X Z. Estimates on Bloch constants for planar harmonic mappings. J Math Anal Appl, 337:880-887 (2007).
  • 9Kuang J C. Applied Inequalities, 3nd ed. Jinan: Shandong Science and Technology Press, 2004.
  • 10熊成继,陈怀惠.Julia引理和Bloch常数[J].中国科学(A辑),2002,32(9):791-796. 被引量:1

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