arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1612.04424math.DSmath.CV
收藏

有理映射的一个正刻画

A positive characterization of rational maps

Dylan P. Thurston

摘要:

什么时候球面的拓扑分支自覆盖等价于CP ^1上的有理映射?威廉·瑟斯顿(William Thurston)在1982年给出了一个答案,他给出了一个否定的标准(一个阻碍地图成为理性的障碍)。我们给出了一个互补的正准则:分支自覆盖等价于有理映射当且仅当存在一个弹性脊,在向后迭代下变得“松散”。这完成了在arXiv:1502.02561中宣布的系列,并在arXiv:1507.05294和arXiv:1607.00340中开始。

英文摘要:

When is a topological branched self-cover of the sphere equivalent to a rational map on CP^1? William Thurston gave one answer in 1982, giving a negative criterion (an obstruction to a map being rational). We give a complementary, positive criterion: the branched self-cover is equivalent to a rational map if and only if there is an elastic spine that gets "looser" under backwards iteration. This completes a series announced in arXiv:1502.02561 and started in arXiv:1507.05294 and arXiv:1607.00340.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑