Chinese Quarterly Journal of Mathematics ›› 1988, Vol. 3 ›› Issue (2): 13-20.
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Abstract: Let S(p),0<p<1,be the class of meromorphic univalent functions f(z)in the unit disk Dwith a simple pole at p and normalization f(0) =f'(0)-1=0. In this paper,we first give a method to constract variation of f within S(p)according to the constraction of variations a function in S. Then we set up the Schiffer differential equation (nf'(n)/f(n)²P(f(η))=q(η) (η∈D\{p}) for the extremal functions of the class S(p)and apply the equation to discuss some properties of extremal functions.
马万仓. 亚纯单叶函数的Schiffer微分方程及其应用[J]. Chinese Quarterly Journal of Mathematics, 1988, 3(2): 13-20.
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