HallsofIvy Science Advisor Homework Helper Messages 42,895 Reaction score 983 Oct 21, 2008 #2 You wouldn't. That makes no sense. Where did you see such a thing?
ice109 Messages 1,708 Reaction score 6 Oct 23, 2008 #3 what kinds of expressions with differentials are valid?
HallsofIvy Science Advisor Homework Helper Messages 42,895 Reaction score 983 Oct 24, 2008 #4 Was that something for rhuelu to think about or an actual question of your own?