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% This macro source file is from the four volume series
% "TeX in Practice" by Stephan von Bechtolsheim, published
% 1993 by Springer-Verlag, New York.
% Copyright 1993 Stephan von Bechtolsheim.
% No warranty or liability is assumed.
% This macro may be copied freely if no fees other than
% media cost or shipping charges are charged and as long
% as this copyright and the following source code itself
% is not changed. Please see the series for further information.
%
% Version: 1.0
% Date: May 1, 1993
%
%
% This source code is documented in 13.1.4, p. II-158.
% Original source in file "math1.TEX", starting line 211.
\wlog{L: "mathenv.tip" ["math1.TEX," l. 211, p. II-158]}%
% This file DOES belong to format "texip."
\def\BeginMath{%
\ifmath
\ifinner
\errmessage{\string\BeginMath: already in math
mode, \string\BeginMath ignored.}%
\else
\errmessage{\string\BeginMath: in display math
mode, terminated and math mode started.}%
$$
$
\fi
\else
$\relax
\fi
}
\def\EndMath{%
\ifmath
\ifinner
$%
\else
\errmessage{\string\EndMath: you are in display math
mode! Should have used \string\EndDisplayMath!}%
$$
\fi
\else
\errmessage{\string\EndMath: already in math
mode, \string\EndMath ignored.}%
\fi
}
\def\BeginDisplayMath{%
\ifmath
\ifinner
\errmessage{\string\BeginDisplayMath: in inline
math mode, terminate it, start display math.}%
$
$$
\else
\errmessage{\string\BeginDisplayMath: already in math
mode, \string\BeginDisplayMath ignored.}%
\fi
\else
$$
\fi
}
\def\EndDisplayMath{%
\ifmath
\ifinner
\errmessage{\string\EndDisplayMath: inline
math mode in effect, did you intend to
write \string\EndMath?}%
$%
\else
$$
\fi
\else
\errmessage{\string\EndDisplayMath: not in math
mode, \string\EndDisplayMath ignored.}%
\fi
}
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