Math & Science ⇒ Summation (sigma) with 2 lines underneath

[latexhelp1]

I have a summation from say k = -5 to 5. I would like to add a line beneath the k = -5 that k \neq 0 (is that the correct way to express mathematically that k does not equal 0?) I do not know how to do the k not equal to 0 part. I would very much appreciate any help you can provide.

My current code for the summation of k = -5 to 5 is:

Code: Select all

\sum_{k=-5}^{5} \pi_k

[Stefan Kottwitz]

With amsmath, you could use \substack:

Code: Select all

\sum_{\substack{k=-5\\k \neq 0}}^{5} \pi_k

substack.png (2.24 KiB) Viewed 26615 times

Stefan