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Multi-indexed sum

ZaidAlyafey

Well-known member
MHB Math Helper
Jan 17, 2013
1,667
How to write something similar to the following

multi-indexed sum.PNG

Or is it better to write

\(\displaystyle \sum_{n=k ,m=1}^{k+1}\)
 
Last edited:

Jameson

Administrator
Staff member
Jan 26, 2012
4,052
Try this syntax that produces the following output:

\large \sum_{p^{m} \le x \atop \text{p is prime }m \ge 1 }

\(\displaystyle \large \sum_{p^{m} \le x \atop \text{p is prime }m \ge 1 } \)

The spacing and sizing could use a little work but it's a good start for now.

EDIT: Just found another one on the same page. Try this code as well:

\large \sum_{\substack{p^{m} \le x \\ \text{p is prime }m \ge 1}}

\(\displaystyle \large \sum_{\substack{p^{m} \le x \\ \text{p is prime }m \ge 1}}\)
 

Evgeny.Makarov

Well-known member
MHB Math Scholar
Jan 30, 2012
2,503
There is also the subarray environment, which is similar to the regular array environment. It allows aligning the subscripts left or right.

\atop is a plain TeX command.