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For example, sum for every k from 0 to n.

How would I do this properly in MathJax format on a site that supports MathJax?

closed as off-topic by Nicol Bolas, Ward, Robert Longson, Pierre.Vriens, Mureinik Jun 16 at 7:33

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5

You can use the `\sum' command:

$\sum_{k=0}^n k = \frac{n^2-n}{2}$

There's a Formatting Sandbox on Mathematics Meta where you can practice.

1

In order to get the preferred notation in accordance with ISO 80000-2, use

$$\sum\limits_{i = 1}^n {a_i}$$

However, the following notations are also used

$$\sum\nolimits_{i = 1}^n {a_i}$$

$$\sum\limits_i {a_i}$$

$$\sum\nolimits_i {a_i}$$

$$\sum {a_i}$$

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