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I don't like the $\xi$ symbol that mathpazo comes with, so I want to go back to Computer Modern for that symbol alone. How can I do this?

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You should follow the instructions listed in Importing a Single Symbol From a Different Font. –  Werner Oct 5 '12 at 22:41
    
I looked at that question, but I'm not sure how to find what number the \xi symbol is in the letters symbols –  Zvpunry Oct 5 '12 at 22:43
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1 Answer 1

up vote 10 down vote accepted

The code is in fontmath.ltx:

\DeclareMathSymbol{\xi}{\mathord}{letters}{"18}

To make the change you want, you can fetch the CM definition of letters and change it into

\DeclareSymbolFont{CMletters}{OML}{cmm}{m}{it}

and then

\DeclareMathSymbol{\xi}{\mathord}{CMletters}{"18}
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Worked! Thanks for the help –  Zvpunry Oct 5 '12 at 22:58
    
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? –  smh Dec 7 '12 at 10:03
    
@smh I don't get this error; please, open a new question, with a link to this one, adding a minimal example producing the error. –  egreg Dec 7 '12 at 12:13
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