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when toggle format what by license comment
May 11, 2012 at 0:26 comment added Jennifer Gao Thanks to both of you, I wasn't familiar with that result! That clears this question up for me nicely.
May 9, 2012 at 17:58 comment added Liviu Nicolaescu This is a special case of the coarea formula.
May 9, 2012 at 10:33 answer added Bazin timeline score: 2
May 9, 2012 at 0:51 comment added Anton Petrunin This is not a good question for MO. See en.wikipedia.org/wiki/Coarea_formula
May 8, 2012 at 20:52 history asked Jennifer Gao CC BY-SA 3.0