When can one Change order of derivatives?

1. Jan 16, 2012

Charanjit

Here is an example...

d/dz(dp/dx) = d/dx(dp/dz)

I dont remember learning this in my calculus or differential equations classes unless it was called something else.

2. Jan 16, 2012

Simon Bridge

Those would be mixed partial derivatives.
Look it up.

The short answer is: almost always.

Last edited: Jan 16, 2012
3. Jan 16, 2012

Charanjit

Hmm...ok never knew that. Thanks.