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arXiv 1303.0134math.CV
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某些单叶函数的第二Hankel行列式的界

Bounds for the Second Hankel Determinant of Certain Univalent Functions

Lee See Keong, V. Ravichandran, Shamani Supramaniam

摘要:

给出了解析函数f(z)=z+ a_2z^2 + a_3z^3 +.的第二Hankel行列式a_2a_4-a_3^2的估计.研究了zf '(z)/f(z)或1+zf”(z)/f'(z)服从某个解析函数的情形.还得到了另外两类的Hankel行列式的估计。特别地,得到了强星形、抛物星形、双纽星形函数的Hankel行列式的估计。

英文摘要:

The estimates for the second Hankel determinant a_2a_4-a_3^2 of analytic function f(z)=z+a_2 z^2+a_3 z^3+...b for which either zf'(z)/f(z) or 1+zf"(z)/f'(z) is subordinate to certain analytic function are investigated. The estimates for the Hankel determinant for two other classes are also obtained. In particular, the estimates for the Hankel determinant of strongly starlike, parabolic starlike, lemniscate starlike functions are obtained.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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