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I am using LyX with MikTeX and I am trying to use the following command \oiiint but I am getting the following error:

 \oiiint

The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

I have added \usepackage{mathdesign} to the preamble in:

Document -> Settings -> LaTeX Preamble

Why is this not working?

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You must add an option to mathdesign for choosing what font family to use; for instance \usepackage[charter]{mathdesign}. Called by itself the package does nothing. –  egreg Oct 10 '13 at 12:50
    
I tried it using Sublime and it sort of worked, as in it outputted the symbol correctly but I got the following message: C:/Users/Colin/Desktop/first.tex:13: Missing $ inserted. [\oiiint] C:/Users/Colin/Desktop/first.tex:14: Missing $ inserted. [] –  Colin747 Oct 10 '13 at 13:44
1  
Do you have a minimal example you can post? –  scottkosty Oct 10 '13 at 16:17
2  
\oiiint has to be placed in math mode, try $\oiiint$. –  Torbjørn T. Oct 10 '13 at 21:29
    
@TorbjørnT. that worked great, thanks. If you want to put it up as an answer I'll accept. –  Colin747 Oct 11 '13 at 10:14

1 Answer 1

up vote 3 down vote accepted

I know nothing about LyX and how you can eventually accomplish the task with it, but mathdesign needs an option for specifying the main typeface to use, for instance

\usepackage[charter]{mathdesign}

Check in the documentation: texdoc mathdesign on a Unix system or this WEB site.

Note that \oiiint is a math symbol, so you have to input it in math mode (inside $...$ or \(...\) if inline, inside \[...\], equation or one of the amsmath environments if displayed).

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