- #1
transmini
- 81
- 1
After doing a couple courses in physics as well as calculus and differential equations, I was starting to wonder about splitting a derivate, such as ## \frac{dy}{dx} ##, into separate pieces ##dy## and ##dx##. I know we've never done it in calculus or differential equations because it isn't technically a fraction, its one thing. But if that's the case, why does it work when doing it in more applied courses such as physics? Are there certain rules on when this kind of thing works and does not?