Let X be an infinite-dimensional Banach space, and let A be a CP Lipschitz bounded starlike body (for instance the unit ball of a smooth norm). We prove that: (1) the boundary partial derivativeA is C-P Lipschitz contractible; (2) there is a C-P Lipschitz retraction from A onto partial derivativeA; (3) there is a C-P Lipschitz map T : A --> A with no approximate fixed points.
机构:
Univ Sao Paulo, Inst Matemat & Estat, Dept Matemat, BR-05311970 Sao Paulo, Brazil
Univ Paris 06, Inst Math Jussieu, Project Analyse Fonct, F-75252 Paris 05, FranceUniv Sao Paulo, Inst Matemat & Estat, Dept Matemat, BR-05311970 Sao Paulo, Brazil
Ferenczi, Valentin
Galego, Eloi Medina
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Univ Sao Paulo, Inst Matemat & Estat, Dept Matemat, BR-05311970 Sao Paulo, BrazilUniv Sao Paulo, Inst Matemat & Estat, Dept Matemat, BR-05311970 Sao Paulo, Brazil