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\sum_{a=0}^{9} k
This command generates the summation operator,
 
 
<math>\sum</math>
 
. The difference between this and <code>\Sigma</code>, which generates the capital letter
 
 
<math>\Sigma</math>
 
, is that <code>\sum</code> appears larger, and that it supports the limits to be displayed below and above the symbol.
 
 
The following example illustrates the difference between <code>\sum</code> and <code>\Sigma</code>.
 
 
<math>
 
\sum_{n=1}^\infty\frac{1}{2^n}=1\qquad\Sigma_{n=1}^\infty\frac{1}{2^n}=1
 
</math>
 
 
This examples are written as:<syntaxhighlight lang="latex" line="1">
 
\sum_{n=1}^\infty
 
\qquad
 
\Sigma_{n=1}^\infty\frac{1}{2^n}=1
 
</syntaxhighlight>
 

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