# How do I use the summation symbol? I want to use the summation symbol (capital Delta from i=-2 to 2) but I can't figure out how to get the 2 on top of the capital Delta.

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Asking on behalf of T. Michael B.. Thanks!

Asking on behalf of T. Michael B.. Thanks!

##### 2 Answers

*Type*

hashtag "sum^2" hashtag

*This looks like:*

#### Explanation:

Hopefully this is what you're trying to achieve.

Here's how you can do that.

#### Explanation:

To expand a little on the answer given by Acquaintance, the summation symbol, which as far as I know is *capital sigma*, **subscripts** and **superscripts**.

Now, the thing to remember about the summation symbol is that although you can use *capital sigma*, "Sigma", which gives you

So, for example, you can write

*without hashtags*

Sigma

*with hashtags*

#Sigma#

On the other hand, you can write

*without hashtags*

sum

*with hashtags*

#sum#

Now, you can add **subscripts** and **superscripts** to the "sum" symbol by using the "_" and "^" characters.

For example, you can write

*without the hashtags*

sum_(i=-2)^2 "whatever"

*with hashtags*

#sum_(i=-2)^2 "whatever"#

In this example, the **subscript**, **superscript**,

So, to sum this up, you can add subscripts and superscripts to the "sum" symbol by using the "_" and "^" characters.

Another example would be

*without hashtags*

sum_(n=0)^(oo) n^2

*with hashtags*

#sum_(n=0)^(oo)n^2#