/[escript]/trunk/doc/user/firststep.tex
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revision 3342 by caltinay, Mon Nov 1 05:21:18 2010 UTC revision 3343 by jfenwick, Wed Nov 10 02:01:29 2010 UTC
# Line 64  which leads to Line 64  which leads to
64  \end{equation}  \end{equation}
65  We often find that use  We often find that use
66  of nested $\sum$ symbols makes formulas cumbersome, and we use the more  of nested $\sum$ symbols makes formulas cumbersome, and we use the more
67  convenient Einstein summation convention\index{summation convention}. This  compact Einstein summation convention\index{summation convention}. This
68  drops the $\sum$ sign and assumes that a summation is performed over any repeated index.  drops the $\sum$ sign and assumes that a summation is performed over any repeated index.
69  For instance we write  For instance we write
70  \begin{eqnarray}  \begin{eqnarray}

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