 Finite sum (source code)

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= Finite sum
{title2=$\sum_{i=1}^n a_i$}

A finite sum adds finitely many terms, for example $\sum_{i=1}^n a_i=a_1+\cdots+a_n$ for a positive <integer> $n$. The empty sum is the <additive identity>. In an <abelian group>, the <associative property> and commutativity of the <abelian group> make the result independent of grouping and order.

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