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讨论关于P^#γ(A,B)的系数估计和偏差定理,其中P^#γ(A,B)表示在单位圆盘内解析且满足/([M^A f(z)]'-1)/(A-B[M^A f(z)]')/〈1的函数f(z)=z+∞∑n=k/an/z^n(k≥2)的类。 相似文献
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设$f$为定义在单位圆盘$\mathbb U=\{z\in \mathbb C:|z|<1\}$的具有标准形式的函数,用$\mathcal S_{s}^{*}$表示$\frac{zf^{\prime}(z)}{f(z)}$ 位于右半平面的$\infty$形区域满足:$\frac{zf^{\prime}(z)}{f(z)}\prec 1+\sin z~(z\in\mathbb U)$的函数类.若$f\in \mathcal S_{s}^{*}$,本文研究了$f^{-1}$的Toeplitz行列式. 相似文献
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首先引进一类具有负系数的广义星象函数子类及其广义λ-Hadamard卷积;其次,利用从属关系证明了属于该类函数的充要条件;最后,研究了在函数类上广义λ-Hadamard卷积及其相关特殊卷积的封闭性质.所得结果改进和推广了Choi等人的主要结果,并得到了一些新结果. 相似文献
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Let SH be the class of functions f = h + ˉg that are harmonic univalent and sensepreserving in the open unit disk U = {z ∈ C : |z| 1} for which f(0) = f′(0)-1 = 0. In the present paper, we introduce some new subclasses of SH consisting of univalent and sensepreserving functions defined by convolution and subordination. Sufficient coefficient conditions,distortion bounds, extreme points and convolution properties for functions of these classes are obtained. Also, we discuss the radii of starlikeness and convexity. 相似文献
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