% Operations used when dealing with complex numbers.
+\ifx\havemjocomplex\undefined
+\def\havemjocomplex{1}
+
% The complex conjugate of its argument.
-\providecommand*{\compconj}[1]{ \overline{#1} }
+\newcommand*{\compconj}[1]{ \overline{#1} }
+
+
+\fi