Herbert Voss wrote:
>
> try
> \newcommand\myDot[1]{\dot{#1}}
> or
> \newcommand\myDotMean[1]{\dot{\mean{#1}}}
>
Thank you very much for your help Herbert.
But I would like to know if there exists a bug with \dot in math mode,
because, yes, I can define other commands to solve the problem, i.e. I
mean, I can use the AMS command \Dot to avoid the problem, but I don't
want to lose the graphics capabilities of lyx to put the time
derivative, because in this way I would have to define every time
derivative that I would like to use, and it is too much. Anyway, I'll
use your recipe,
