Re: Strange behaviour on user command defined in preamble.

[Carlos Eduardo de Brito Novaes]

Just for information, the actual command definition is presented below.
I plan to use at the very first time a symbol is declared so it will get 
written 
to the list of symbols with the corresponding description.

\newcommand{\simbolo}[2]
{
  \ifthenelse{\equal{#2}{}}
    {\addcontentsline{los}{simbolo}{#1}#1}
    {\addcontentsline{los}{simbolo}{#1: #2}#1}
}