Tue Jul 7 14:11:32 CEST 2009

On Jul 7, 2009, at 7:19 AM, wawan wrote:

> Hi all
> Can I using
> \begin{def_name}
> \end{def_name}
>
> to call def ?
> or how to using that command ( begin--end)

You need to define the new environment (see _The LaTeX Companion)

\newenvironment{defname}
%commands to happen at beginning of environment
{}%
%commands to happen at end of environment
{}%

If you need grouping which passes between beginning and end you'll
have to use the appropriate command instead of brackets

William

--