Oscar wrote:
> 
> Hi all:
> 
> I am trying to get the time derivative of the mean value of a variable.
> To
> implement the mean value of a variable I defined in the preamble:
> 
> \newcommand{\mean}[1]{<#1>}
> 
> I guess that there is a problem with \dot in math mode, but maybe I have
> missed something important. What am I doing wrong? How can I do?

try 
\newcommand\myDot[1]{\dot{#1}}
or
\newcommand\myDotMean[1]{\dot{\mean{#1}}}

Herbert

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