Math summation symbol in LaTeX

Posted: 15th August 2009 by Tim in LaTeX
Tags: , , , , , , , ,

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)

summation_small

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

summation_large

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

10
n=1 n2




  1. André says:

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

  2. Gaurav Mittal says:

    Thanks a lot

  3. Shashee Kant Sharma says:

    thanx a lot dear

  4. Ted says:

    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!

  5. no one says:

    \limits isn’t better?

    for example:
    \sum\limits_{i=1}^n i^2

    see this page:
    http://latex.wikia.com/wiki/Sum-class_symbol

  6. Kumar Gaurav says:

    Thanks man