How to change specific symbols in math mode

Question

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

\DeclareSymbolFont{CMlargesymbols}{OMX}{cmex}{m}{n}
\DeclareMathSymbol{\‎‏‎sum‎}{\mathop}{CMlargesymbols}{"50}‎‎‎

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

Try "undefining" it first via \let\sum\relax before your \DeclareMathSymbol definition. — Werner, Dec 07 '12 at 18:27
I get no error. Please, add a minimal working example (MWE). The two commands about \sum should go after loading mathdesign. — egreg, Dec 07 '12 at 18:50
@egreg the cause of this error is calling amsmath package. but i don't know why this happens? — smh, Dec 08 '12 at 11:15

score 4 · Accepted Answer · answered Dec 08 '12 at 11:30

The correct loading order should be

\documentclass{article}

\usepackage[utopia]{mathdesign}

\DeclareSymbolFont{CMlargesymbols}{OMX}{cmex}{m}{n}
\DeclareMathSymbol{\sum}{\mathop}{CMlargesymbols}{"50}

\usepackage{amsmath}                                       

\begin{document}

$\sum$

\end{document}

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

score 0 · Answer 2 · answered Dec 07 '12 at 18:49

0

How about if you try

\DeclareMathSymbol{\mysum}{\mathop}{CMlargesymbols}{"50}

and then at the end of the preamble

\renewcommand{\sum}{\mysum}

answered Dec 07 '12 at 18:49

A.Ellett

50,533

This should be by no means necessary. – egreg Dec 07 '12 at 18:53
my bad. I should have tried a MWE to see if I got the same error. – A.Ellett Dec 07 '12 at 19:08

How to change specific symbols in math mode

2 Answers2

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