# Function is a change of variables?

1. Jul 5, 2014

### brunob

Hi there!

The question is: if I have to prove that a function is a change of variable it is sufficient to prove that the function is a diffeomorphism? i.e. prove that the function is bijective, differentiable, and its inverse is differentiable?

Thanks!

2. Jul 6, 2014

### HallsofIvy

What, exactly, is your definition of "change of variables"? How does it differ from a general function?