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Oct 13, 2016 at 13:40 comment added GeoMatt22 @Firebug your point is probably what I was thinking of even more (I gave +1 as soon as I saw it).
Oct 13, 2016 at 13:18 comment added Firebug @GeoMatt22 regarding your argument about pretty notation, I think that's fair, including the point I raised on my answer regarding the derivative, towards facilitation of gradient based optimization implementations.
Aug 23, 2016 at 19:43 comment added GeoMatt22 In terms of "pretty" notation, the exponent on the norm term prevents an extra 1/p exponent when it is expanded as a sum. This may have influenced the conventions? (i.e. sum of squares may have preceded the vector-norm notation?)
Aug 17, 2016 at 15:38 vote accept Haitao Du
Aug 17, 2016 at 14:47 history edited Mark L. Stone CC BY-SA 3.0
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Aug 17, 2016 at 14:42 history answered Mark L. Stone CC BY-SA 3.0