Shapes of stars
Sadayoshi Kojima and Yasushi Yamashita
Proc. Amer. Math. Soc. 117 (1993), 845-851
Primary 57M50; Secondary 51M04, 51M09, 51M20
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Abstract: In this paper we construct a natural geometric structure for the space of shapes of a star-shaped polygon. Roughly speaking we find: The set of similarity classes of marked stars forms a hyperbolic right angle pentagon bundle over the space of external angle sets of inscribed pentagons. The assignment of the shape of its fiber to each angle set forms a hyperbolic plane bundle over the Teichmüller space of hyperbolic right angle pentagons. Any automorphism induced by renumbering is compatible with these geometric structures.
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