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arXiv 1303.7243math.DSmath.CV
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拟正则映射的朱利亚集的大小

The size of Julia sets of quasiregular maps

Walter Bergweiler

摘要:

孙道春和杨洛证明了有理函数的Fatou-Julia迭代理论的许多结果推广到了黎曼球面上的拟正则自映射,其次数超过了伸缩量。我们表明,在这种情况下,在对比的情况下,有理函数,朱利亚集可能有豪斯多夫维数为零。另一方面,我们证明了一个依赖于度和伸缩量的度规函数,使得关于这个度规函数的Hausdorff测度总是正的,但也可能是有限的.

英文摘要:

Sun Daochun and Yang Lo have shown that many results of the Fatou-Julia iteration theory of rational functions extend to quasiregular self-maps of the Riemann sphere for which the degree exceeds the dilatation. We show that in this context, in contrast to the case of rational functions, the Julia set may have Hausdorff dimension zero. On the other hand, we exhibit a gauge function depending on the degree and the dilatation such that the Hausdorff measure with respect to this gauge function is always positive, but may be finite.

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