See the "Gauss's Law Sketch Proof" paragraph http://en.wikibooks.org/wiki/Modern_Physics:Gauss's_Law_for_Electricity]here.[/PLAIN] [Broken] Griffiths uses mainly the same argument to prove Gauss's law, but I don't really see the connection between the fact that the flux is Q/epsilon for a sphere and the conclusion that it is worth this quantity too for any closed surface. Can someone point to a more mathematical proof? Or simply unveil what I'm missing in this argument. Thanks.