/[escript]/trunk/doc/user/notation.tex
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revision 2922 by jfenwick, Thu Jan 28 02:03:15 2010 UTC revision 2923 by jfenwick, Thu Feb 4 04:05:36 2010 UTC
# Line 21  There are two rules which make up the co Line 21  There are two rules which make up the co
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22  firstly, the rank of the tensor is represented by an index. For example, $a$ is a scalar; $b\hackscore{i}$ represents a vector; and $c\hackscore{ij}$ represents a matrix.  firstly, the rank of the tensor is represented by an index. For example, $a$ is a scalar; $b\hackscore{i}$ represents a vector; and $c\hackscore{ij}$ represents a matrix.
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24  Secondly, if an expression contains subscripted variables, they are assumed to be summed over all possible values, from $0$ to $n$. For example, for the following expression:  Secondly, if an expression contains repeated subscripted variables, they are assumed to be summed over all possible values, from $0$ to $n$. For example, for the following expression:
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