- #1
Othin
- 36
- 1
Sorry about the title, had a hard time trying to fit the question on the given space. The question is quite simple : If [itex] F = F(x_1,...,x_n,t) [/itex] , Under what conditions is [itex] \frac{d }{dt} \frac{\partial F }{\partial xi} = \frac{\partial }{\partial xi} \frac{dF }{dt} [/itex] true?