Definition talk:Total Derivative

Prime.mover, check out the bottom of my sandbox, where Larson has this as a theorem and proves it. Do you want me to put his proof as a justification of this definition? Or should I give Larson's theorem a page of its own and then say as a note "some sources have this as a definition rather than a theorem"? --GFauxPas 15:11, 2 April 2012 (EDT)
 * Alternatively, Larson's proof could be used as one part of a 'proof that defs are equiv'. --Lord_Farin 15:13, 2 April 2012 (EDT)