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Application to O(N) methods



\begin{displaymath}\rho({\bf r},{\bf r'}) = \sum_{\alpha \beta} \phi_{\alpha}({\bf r})
K^{\alpha \beta} \phi_{\beta}({\bf r'}) \end{displaymath}

\includegraphics[]{spheres.eps}


Peter D. Haynes 2001-11-07