The dynamics of Super-Apollonian continued fractions
The dynamics of Super-Apollonian continued fractions
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超日神连续分数的动力学
DOI:
10.1090/tran/7372
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发表时间:
2019
影响因子:
1.3
通讯作者:
Stange, Katherine E.
中科院分区:
文献类型:
--
作者:
Chaubey, Sneha;Fuchs, Elena;Hines, Robert;Stange, Katherine E.
We examine a pair of dynamical systems on the plane induced by a pair of spanning trees in the Cayley graph of the Super-Apollonian group of Graham, Lagarias, Mallows, Wilks, and Yan. The dynamical systems compute Gaussian rational approximations to complex numbers and are “reflective” versions of the complex continued fractions of AL Schmidt. They also describe a reduction algorithm for Lorentz quadruples, in analogy to work of Romik on Pythagorean triples. For these dynamical systems, we produce an invertible extension and an invariant measure, which we conjecture is ergodic. We consider some statistics of the related continued fraction expansions, and we also examine the restriction of these systems to the real line, which gives a reflective version of the usual continued fraction algorithm. Finally, we briefly consider an alternate setup corresponding to a tree of Lorentz quadruples ordered by arithmetic complexity.
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