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The full periodicity kernel of the trefoil

Carme LeseduarteJaume Llibre — 1996

Annales de l'institut Fourier

We consider the following topological spaces: O = { z : | z + i | = 1 } , O 3 = O { z : z 4 [ 0 , 1 ] , Im z 0 } , O 4 = O { z : z 4 [ 0 , 1 ] } , 1 = O : | z - i | = 1 } { z : z [ 0 , 1 ] } , 2 = 1 { z : z 2 [ 0 , 1 ] } , et T = { z : z = cos ( 3 θ ) e i θ , 0 θ 2 π } . Set E { O 3 , O 4 , 1 , 2 , T } . An E map f is a continuous self-map of E having the branching point fixed. We denote by Per ( f ) the set of periods of all periodic points of f . The set K is the of E if it satisfies the following two conditions: (1) If f is an E map and K Per ( f ) , then Per ( f ) = . (2) If S is a set such that for every E map f , S Per ( f ) implies Per ( f ) = , then K S . In this paper we compute the full periodicity kernel of O 3 , O 4 , 1 , 2 and T .

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