TeX - LaTeX Stack Exchange is a question and answer site for users of TeX, LaTeX, ConTeXt, and related typesetting systems. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I use \usepackage[utopia]{mathdesign} for math numbers, symbols, etc. but I want to change the \sum symbol to default computer modern one. When I use


it results an error: Command '\sum' already defined. How can I change the \sum symbol?

share|improve this question
Try "undefining" it first via \let\sum\relax before your \DeclareMathSymbol definition. – Werner Dec 7 '12 at 18:27
Related: Importing a single symbol from a different font – Werner Dec 7 '12 at 18:28
I get no error. Please, add a minimal working example (MWE). The two commands about \sum should go after loading mathdesign. – egreg Dec 7 '12 at 18:50
@egreg the cause of this error is calling amsmath package. but i don't know why this happens? – smh Dec 8 '12 at 11:15
up vote 4 down vote accepted

The correct loading order should be








This is because amsmath patches some of the commands to become "dots-aware".

share|improve this answer

How about if you try


and then at the end of the preamble

share|improve this answer
This should be by no means necessary. – egreg Dec 7 '12 at 18:53
my bad. I should have tried a MWE to see if I got the same error. – A.Ellett Dec 7 '12 at 19:08

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.