LaTeX is great in that it can display all those strange math symbols for you. Summation is a common symbol in math and really useful to know how to display in LaTeX.

There are two ways of displaying the symbol: compressed to fit onto one line (useful when printing long equations or proofs) or in a larger, more readable format. See below for an example.

Let’s say we want to print out the sum of *n^2* for *n* between 1 and 10. To do this we would do the following:

`\sum_{n=1}^{10} n^{2} (compressed format)`

`\displaystyle\sum_{n=1}^{10} n^{2} (full format)`

Remember that the code must be in math tags. ie: $\sum…$, \[\sum...\], etc.

10

n=1 n2

n=1 n2

You saved my life! I needed to display the full format but did not know the comand \displaystyle – thanks a lot!

Thanks a lot

thanx a lot dear

Suppose in the above expression, we wanted to include the constraint subject to “n not equal to 5″ . How would the expression now be written in LaTex?

Many thanks!

\limits isn’t better?

for example:

\sum\limits_{i=1}^n i^2

see this page:

http://latex.wikia.com/wiki/Sum-class_symbol