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(latex.info)\newenvironment

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\newenvironment
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      \newenvironment{nam}[args]{begdef}{enddef}
      \newenvironment{nam}[args][default]{begdef}{enddef}
      \renewenvironment{nam}[args]{begdef}{enddef}

   These commands define or redefine an environment.

`nam'
     The name of the environment.  For `\newenvironment' there must be
     no currently defined environment by that name, and the command
     `\nam' must be undefined.  For `\renewenvironment' the environment
     must already be defined.

`args'
     An integer from 1 to 9 denoting the number of arguments of the
     newly-defined environment.  The default is no arguments.

`default'
     If this is specified, the first argument is optional, and `default'
     gives the default value for that argument.

`begdef'
     The text substituted for every occurrence of `\begin{nam}'; a
     parameter of the form `#n' in `cmd' is replaced by the text of the
     nth argument when this substitution takes place.

`enddef'
     The text substituted for every occurrence of `\end{nam}'.  It may
     not contain any argument parameters.