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Sep 20, 2014 at 8:41 vote accept user62498
Aug 29, 2014 at 7:41 comment added user62498 @ Dear Benjamin Dickman , thanks, your answer is very perfect
Jun 12, 2014 at 22:36 answer added Benjamin Dickman timeline score: 9
Jun 12, 2014 at 21:50 comment added Igor Khavkine I think that finite dimensional $l^p$ spaces are already a counter-example. The norm is not differentiable at zero. Or am I missing something?
Jun 12, 2014 at 19:23 history asked user62498 CC BY-SA 3.0