Question 1111645
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Let *[tex \Large i] be the index number of the element of the set.  In general, a set can be specified *[tex \Large a\ =\ \{a_0,\,a_1,\,a_2,\,\cdots,\,a_n\}]


The sum of these elements can be denoted *[tex \Large \sum_{i\,=\,0}^n\ a_i =\ a_0\,+\,a_1\,+\,a_2\,+\,\cdots\,+\,a_n]


For your example: *[tex \Large \sum_{i\,=\,0}^2\ a_i\ =\ a_0\,+\,a_1\,+\,a_2\ =\ 2\ +\ 3\ +\ 1\ =\ 6] 


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
<img src="http://c0rk.blogs.com/gr0undzer0/darwin-fish.jpg">
*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \  

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