General ⇒ Warnings in console

[Cham]

I'm getting tons of warnings in the console, about something that I don't think I used at all in my code. I'm wondering what this is about. The document is compiling fine, though.

Here's a sample of the warnings :

LaTeX Warning: Command \' invalid in math mode on input line 1908.

Anyone has an idea of what this is about ? What is this \' ?

[Cham]

Got it !

I was using some French letters with accent (é, è, ...) under the \mathrm{} command, and this is what caused the warnings, apparently. I replaced that command with \text{}, and the warnings are all gone now.

But then, what is the difference between these two commands ?

EDIT : Ok, I got the answer to my last question there :

http://tex.stackexchange.com/questions/ ... and-mathrm