We prove that a fixed configuration of N - 1 masses in the plane can be extended to a central configuration of N masses by adding a specified additional mass only in finitely many ways. This holds for a family of potential functions including the Newtonian gravitational case and the classical planar point vortex model.
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Univ Paris 07, Dept Math, F-75251 Paris 05, France
Observ Paris, IMCCE, UMR 8028, F-75014 Paris, FranceUniv Paris 07, Dept Math, F-75251 Paris 05, France
Chenciner, A.
Fejoz, J.
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Observ Paris, IMCCE, UMR 8028, F-75014 Paris, France
Univ Paris 06, Inst Math, UMR 7586, F-75013 Paris, FranceUniv Paris 07, Dept Math, F-75251 Paris 05, France
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Univ Vic Univ Cent Catalunya UVic UCC, Escola Politecn Super, Dept Tecnol Digitals & Informac, C de la Laura 13, Vic 08500, Catalonia, SpainUniv Vic Univ Cent Catalunya UVic UCC, Escola Politecn Super, Dept Tecnol Digitals & Informac, C de la Laura 13, Vic 08500, Catalonia, Spain
Corbera, Montserrat
Cors, Josep
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Univ Politecn Cataluna, Matemat Aplicada 3, Manresa 08242, Barcelona, SpainUniv Vic Univ Cent Catalunya UVic UCC, Escola Politecn Super, Dept Tecnol Digitals & Informac, C de la Laura 13, Vic 08500, Catalonia, Spain
Cors, Josep
Llibre, Jaume
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Univ Autonoma Barcelona, Dept Matemat, E-08193 Barcelona, Catalonia, SpainUniv Vic Univ Cent Catalunya UVic UCC, Escola Politecn Super, Dept Tecnol Digitals & Informac, C de la Laura 13, Vic 08500, Catalonia, Spain
Llibre, Jaume
Moeckel, Richard
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Univ Minnesota, Sch Math, Minneapolis, MN 55455 USAUniv Vic Univ Cent Catalunya UVic UCC, Escola Politecn Super, Dept Tecnol Digitals & Informac, C de la Laura 13, Vic 08500, Catalonia, Spain