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Feb 10, 2010 at 22:09 comment added Ady This is true for all [real] Banach spaces (separable or not), due to K.Jarosz siue.edu/MATH/kj_papers/AnyBanach.pdf .
Feb 9, 2010 at 21:35 comment added Bill Johnson Obviously I should not have relied on my memory. Thanks for the correction, Leonid.
Feb 5, 2010 at 3:21 comment added Bill Johnson Bill Davis proved in the 1970s that any (I think separable) Banach space can be equivalently renormed so that the only isometries are $\pm I$.
Feb 5, 2010 at 2:32 history answered Ady CC BY-SA 2.5