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I am using the package MinionPro. But I need some symbols, for example, \gnapprox and \mho, available on the package amssymb.

Well, here is my code (as minimal as possible):

\documentclass{report}
\usepackage{MinionPro}
\usepackage{amssymb}

\begin{document}
\[\gnapprox \]

\[\mho \]
\end{document}

But I got the errors:

Command `\mathfrak' already defined. \DeclareMathAlphabet{\mathfrak}{U}{euf}{m}{n}
Command `\mathfrak' not defined as a math alphabet. ...athAlphabet{\mathfrak}{bold}{U}{euf}{b}{n}
Command `\centerdot' already defined. ...ymbol{\centerdot} {\mathbin}{AMSa}{"05}
Command `\veebar' already defined. ...mbol{\veebar} {\mathbin}{AMSa}{"59}
Command `\barwedge' already defined. ...mbol{\barwedge} {\mathbin}{AMSa}{"5A}
Command `\doublebarwedge' already defined. ...ol{\doublebarwedge} {\mathbin}{AMSa}{"5B}
Command `\circledS' already defined. ...mbol{\circledS} {\mathord}{AMSa}{"73}
Command `\dotplus' already defined. ...mbol{\dotplus} {\mathbin}{AMSa}{"75}
Command `\complement' already defined. ...mbol{\complement} {\mathord}{AMSa}{"7B}
Command `\divideontimes' already defined. ...ol{\divideontimes} {\mathbin}{AMSb}{"3E}
Command `\thicksim' already defined. ...ol{\thicksim} {\mathrel}{AMSb}{"73}
Command `\thickapprox' already defined. ...ol{\thickapprox} {\mathrel}{AMSb}{"74}
Command `\hslash' already defined. ...ol{\hslash} {\mathord}{AMSb}{"7D}

How is the right way to use both packages?

share|improve this question
1  
take a look at the answer to this question to see how to include just a few symbols from a font. the symbols \gnapprox and \mho are in the msbm10 font. you can texdoc amsfonts and look in appendix e (p.37) for their location in the font, or set your own font chart using the technique in the answer already mentioned. –  barbara beeton Jan 23 '13 at 16:24
    
@barbarabeeton, great! I'm editing that solution to my case but I don't know what to do with the command \hyphenchar\font45. Should I change something? Should I look at the font table to some particular glyph? –  Sigur Jan 23 '13 at 16:38
    
you can simply ignore the \hyphenchar\font45 and leave an empty group {} in its place. \hyphenchar is really needed only for text fonts. the relevant command for msbm is in the file umsb.fd: \DeclareFontFamily{U}{msb}{} –  barbara beeton Jan 23 '13 at 16:56
1  
i don't have access to minion pro, so i can't really investigate this. but instead of msbm10 you might try msbm9, making a wild guess that minion symbols really are generally smaller than computer modern (which is what msbm is based on). –  barbara beeton Jan 23 '13 at 17:10
2  
Note also that MnSymbol, desgined to work with Minion, has some of the symbols, e.g., \gnapprox. However, it seems that there is no \mho. –  mafp Jan 23 '13 at 17:55
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