latex双栏

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  1. \newlength{\halfpagewidth}

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    \begin{multicols}{2}

    Bla bla...

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    %

    \leftsep

    \begin{equation*}

    \label{eqn:planar:Hz02}

    \begin{cases}

    \delta A + \kappa B = 0 \\

    (\kappa\sin\kappa d-\gamma\cos\kappa d)A+(\kappa\cos\kappa d+\gamma\sin\kappa d)B=0

    \end{cases}

    \end{equation*}

    \rightsep

    %

    \begin{multicols}{2}

    Bla bla...

    \end{multicols