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Jan 14, 2021 at 2:17 comment added Willie Wong The $p = 2$ case is also well-known for people who work in wave equations (for I hope obvious reasons). For example, it is used lots when studying the spherically symmetric Einstein-scalar-field model in mathematical relativity; I'd say every other paper there uses this formula either explicitly or implicitly.
Jan 13, 2021 at 20:51 comment added Iosif Pinelis @TerryTao : Thank you for the references.
Jan 13, 2021 at 20:50 comment added Iosif Pinelis @ZachTeitler : Thank you for the reference.
Jan 13, 2021 at 17:30 comment added Terry Tao Correction: that paper is by Carbery, Christ, and Wright. The general case is implicit in a followup paper mathscinet.ams.org/mathscinet-getitem?mr=1928871 of Katz, Krop, and Maggioni in 2002, proved by "a simple application of the fundamental theorem of calculus".
Jan 13, 2021 at 17:10 comment added Terry Tao The $p=2$ case is also stated in the proof of Lemma 6.2 of this 1999 paper of Carbery and Wright: mathscinet.ams.org/mathscinet-getitem?mr=1683156 , with the three word proof "By Stokes' theorem".
Jan 13, 2021 at 16:52 history answered Zach Teitler CC BY-SA 4.0