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Sigma notation

DeusAbscondus

Active member
Jun 30, 2012
176
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
Jan 26, 2012
995
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

Administrator
Staff member
Feb 24, 2012
13,775
Also, using the MATH tags (click the sigma button in the toolbar) as follows:

[MATH]\sum_{k=0}^{\infty}[/MATH]

will produce:

\(\displaystyle \sum_{k=0}^{\infty}\)