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Critically-Finite Dynamics on the Icosahedron

Authors
  • crass, scott
Publication Date
Jan 19, 2020
Source
MDPI
Keywords
Language
English
License
Green
External links

Abstract

A recent effort used two rational maps on the Riemann sphere to produce polyhedral structures with properties exemplified by a soccer ball. A key feature of these maps is their respect for the rotational symmetries of the icosahedron. The present article shows how to build such &ldquo / dynamical polyhedra&rdquo / for other icosahedral maps. First, algebra associated with the icosahedron determines a special family of maps with 60 periodic critical points. The topological behavior of each map is then worked out and results in a geometric algorithm out of which emerges a system of edges&mdash / the dynamical polyhedron&mdash / in natural correspondence to a map&rsquo / s topology. It does so in a procedure that is more robust than the earlier implementation. The descriptions of the maps&rsquo / geometric behavior fall into combinatorial classes the presentation of which concludes the paper.

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