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        PARAMETRIC REPRESENTATIONS OF QUASICONFORMAL MAOOINGS*

        2021-01-07 06:45:08ZhenlianLIN林珍連

        Zhenlian LIN (林珍連)

        School of Mathematical Sciences, Huaqiao University, Quanzhou 362021, China E-mail : zhenlian@hqu.edu.cn

        Qingtian SHI (石擎天)

        School of Mathematics and Computer Science, Quanzhou Normal University,Quanzhou 362000, China E-mail : shiqingtian2013@gmail.com

        2 Two Counterexamples of the Parametric Representations

        3 Parametric Representation of

        Given a measurable functionμ(z),letfμbe the normal solution of the Beltrami equation?zf=μ?zf.Ifμhas compact support on?,thenfμcan be represented as follows:

        Theorem 3.1([2])Letμ(z)be a measurable function which has compact support on??C.If‖μ‖∞≤k<1,then there exists a unique solutionf=fμsuch thatf(0)=0 andfz?1∈Lpforp>2.Moreover,fcan be expressed in the following form:

        4 Auxiliary Application of Parametric Representation

        Using the parametric representation ofin Theorem 1.1,Eremenko and Hamilton derive the formula(1.6)to prove the area distortion theorem[6].This method is relatively simple compared to others,and the sharp constants in the area distortion inequality are obtained from it,but we find that the parametric representation theorem is false and the area distortion formula(1.6)can not be derived from the equalities(1.3)–(1.5).In this section,by applying Theorem 3.4,we get that the formula(1.6)still holds true for allf∈;that is,the method used by Eremenko and Hamilton in[6]can still be used to prove the area distortion theorem.

        In fact,because

        we have that

        Astis a real variable,then,by applying the parametric representation in(3.3),

        Therefore,from(4.2),the relation(4.1)can be simplified to

        by the fact that(Pρ)ω=Tρ,which implies that the relation(1.6)holds true for the parametric representation in(3.3).

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