# Sigma notation

#### DeusAbscondus

##### Active member
Hi folks,
Could someone please tell me how I can clean this up, $\Sigma_{k=0}^\infty$ placing sub-script and super-script directly below and above $\Sigma$ respectively?

Here is the raw code I used to get the above faulty text:
Code:
\Sigma_{k=0}^\infty

Thanks kindly,
Deo Abscondo

#### Chris L T521

##### Well-known member
Staff member
Hi folks,
Could someone please tell me how I can clean this up, $\Sigma_{k=0}^\infty$ placing sub-script and super-script directly below and above $\Sigma$ respectively?

Here is the raw code I used to get the above faulty text:
Code:
\Sigma_{k=0}^\infty

Thanks kindly,
Deo Abscondo
Try doing
Code:
\sum_{k=0}^{\infty}
instead will give you $\sum_{k=0}^{\infty}$. However, if you're not in \$\$ ... \$\$ land, then you'll have to do use this instead
Code:
\displaystyle \sum_{k=0}^{\infty}
to get the limits to appear above and below like this: $\displaystyle\sum_{k=0}^{\infty}$. There's a way to brute force it if you're not in an displayed environment:
Code:
\sum\limits_{k=0}^{\infty}
as seen here: $\sum\limits_{k=0}^{\infty}$

#### MarkFL

$$\displaystyle \sum_{k=0}^{\infty}$$