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Numerical Algorithm

Rewrite as

\begin{displaymath}
\dot{\bf z_i} = {\bf p_i},  \
\dot{\bf p_i} = \frac{1}{m_...
...rt z_i -z_j\vert)}{{\bf \vert z_i -z_j\vert}}({\bf z_i -z_j}).
\end{displaymath} (5)

Introducing the notation

\begin{displaymath}\vec{\bf x} = \left\{ {\bf z_i}, {\bf p_i} \right\},  \
\...
... p_i},
\frac{1}{m_i} (\phi_i - \gamma {\bf p_i}) \right\} , \end{displaymath}

we get

\begin{displaymath}\dot{\vec{\bf x}} = \vec{\bf f}(\vec{\bf x}).\end{displaymath}


\begin{displaymath}
{\vec{\bf x}}_{n+1} = {\vec{\bf x}}_n + \frac{k}{2}
\left...
...f f}(\vec{\bf x}_n + h \vec{\bf f}(\vec{\bf x}_n))
\right).
\end{displaymath} (6)



Liya Zhornitskaya 2002-06-19