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On fractional iterates of a homeomorphism of the plane. (English) Zbl 1064.39025
Summary: We find all continuous iterative roots of $$n$$th order of a Sperner homeomorphism of the plane onto itself [cf. E. Sperner, Abh. Math. Semin. Hamb. Univ. 10, 1–48 (1934; Zbl 0009.18305)].

MSC:
 39B12 Iteration theory, iterative and composite equations 54H20 Topological dynamics (MSC2010) 37E30 Dynamical systems involving homeomorphisms and diffeomorphisms of planes and surfaces
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