# Toronto Math Forum

## APM346-2021S => APM346--Lectures & Home Assignments => Chapter 1 => Topic started by: Jiaqi Bi on January 23, 2021, 10:53:54 AM

Title: Math Notation Question
Post by: Jiaqi Bi on January 23, 2021, 10:53:54 AM
For example, I am solving an equation that leads me to this step: $u_x=e^u\cdot g(x)$,
Should I use $\frac{\partial u}{\partial x}$ as my left-hand side or use $\frac{du}{dx}$?
Title: Re: Math Notation Question
Post by: Victor Ivrii on January 24, 2021, 07:56:05 AM
it depends: if $u=u(x)$ you can use either. If $u=u(x,y)$ then only partial derivative would be correct.