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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
+}