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:
Departamento de Matemáticas, Facultad de Ciencias, Universidad Nacional Autónoma de MéxicoDepartamento de Matemáticas, Facultad de Ciencias, Universidad Nacional Autónoma de México
机构:
Nagoya Univ, Grad Sch Informat Sci, Chikusa Ku, Furo Cho, Nagoya, Aichi 4648601, JapanNagoya Univ, Grad Sch Informat Sci, Chikusa Ku, Furo Cho, Nagoya, Aichi 4648601, Japan