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Sep 10 at 3:32 vote accept pseudocydonia
Aug 30 at 9:05 comment added Akira You can have a look at the works by Nicola Gigli on second-order differential calculus on some special metric spaces.
S Aug 30 at 8:46 history suggested J. W. Tanner
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Aug 30 at 6:50 history became hot network question
Aug 30 at 2:12 comment added Anton Petrunin @DanielAsimov for Lipschitz curves it is defined almost everywhere; moreover integraiting it, you get the length of curve.
Aug 30 at 0:47 comment added Daniel Asimov For the overwhelming majority of continuous curves, this definition has no meaning (in an arcwise connected component of a metric space), because the limit does not exist.
Aug 29 at 23:28 answer added Anton Petrunin timeline score: 9
Aug 29 at 23:11 review Suggested edits
S Aug 30 at 8:46
Aug 29 at 22:50 history asked pseudocydonia CC BY-SA 4.0