21 \def\deq{\stackrel{\mathrm{def}}{=}}

    21 \def\deq{\stackrel{\mathrm{def}}{=}}

    22 \def\pd#1#2{\frac{\partial #1}{\partial #2}}

    22 \def\pd#1#2{\frac{\partial #1}{\partial #2}}

    23 \def\lf{\overline{\cC}}

    23 \def\lf{\overline{\cC}}

    24 \def\ot{\otimes}

    24 \def\ot{\otimes}

    25 

    25 

    27 \long\def\noop#1{}

    28 \long\def\noop#1{}

    28 

    29 

    29 % equations

    30 % equations

    30 \newcommand{\eq}[1]{\begin{displaymath}#1\end{displaymath}}

    31 \newcommand{\eq}[1]{\begin{displaymath}#1\end{displaymath}}

    31 \newcommand{\eqar}[1]{\begin{eqnarray*}#1\end{eqnarray*}}

    32 \newcommand{\eqar}[1]{\begin{eqnarray*}#1\end{eqnarray*}}