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
期刊:
Science in China Series A: Mathematics
影响因子:
--
通讯作者:
S. Qiu
S. Qiu
中科院分区:
其他
文献类型:
--
作者:
S. Qiu

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得到了Ramanujan广义模方程奇异值的一些性质和渐近尖界。由此可以得到Hersch-Pfluger畸变函数η K(r)和Agard η-畸变函数ηK(t)的无穷乘积表示。利用这些结果,改进了显式拟共形Schwan引理,得到了Schottky上界的若干性质,并证明了关于线性偏差函数λ(K)的一个猜想.
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.