Singular values, quasiconformal maps and the Schottky upper bound
Singular values, quasiconformal maps and the Schottky upper bound
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DOI:
10.1007/bf02882264
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发表时间:
1998-12
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影响因子:
--
通讯作者:
S. Qiu
中科院分区:
文献类型:
--
作者:
S. Qiu
Some properties and asymptotically sharp bounds are obtained for singdar values of Ramanujan’s generalized modular equation. from which infinite-product representations of the Hersch-Pfluger ϕdimtortion function ϕK(r) and the Agard η-distortion function ηK(t) follow. By these results, the explicit quasiconformal Schwan lemma is improved, several properties are obtained for the Schottky upper bound, and a conjecture on the linear distortion function λ (K) is proved to be true.