Fixing Subscript and Superscript with $\Sigma$

[DeusAbscondus]

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:

\Sigma_{k=0}^\infty

Thanks kindly,
Deo Abscondo

 

[Chris L T521]

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:

\Sigma_{k=0}^\infty

Thanks kindly,
Deo Abscondo

Try doing

\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

\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:

\sum\limits_{k=0}^{\infty}

as seen here: $\sum\limits_{k=0}^{\infty}$

 

[MarkFL]

Also, using the MATH tags (click the sigma button in the toolbar) as follows:

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

will produce:

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