# index of summation

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• May 23rd 2009, 07:09 PM
VonNemo19
index of summation
How do you write the sum from i=1 to n with latex?
• May 23rd 2009, 07:18 PM
Krizalid
$$\sum_{i=1}^{n}$$

in this case the {n} is unnecessary, 'cause is just one element; if you want to type something like $\sum_{i=1}^{n-1},$ then you require to add the brackets {} for n-1.