We prove that if X is a real Banach space, with dim X greater than or equal to 3, which contains subspace of codimension I which is I-complemented in X and whose group of isometries is almost transitive then X is isometric to a Hilbert space. This partially answers the Banach-Mazur rotation problem and generalizes some recent related results.
机构:
Univ Paris Est Marne La Vallee, Lab Analyse & Math Appl, F-77454 Marne La Vallee 2, FranceUniv Paris Est Marne La Vallee, Lab Analyse & Math Appl, F-77454 Marne La Vallee 2, France
机构:
Institute of Mathematics and Physics, University of Technology, Bydgoszcz PL-85-796Institute of Mathematics and Physics, University of Technology, Bydgoszcz PL-85-796