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I am trying to generate the triple integral in the following equation (The preamble is large, due to other requirements)

\documentclass[11pt,headings=small,fleqn]{scrreprt} % highest level is chapter
%\documentclass[12pt,journal,compsoc]{report}
\usepackage[Glenn]{fncychap} %To add a rectangle at the beginning of each chapter
\usepackage[greek,english]{babel} % for English text only
%\usepackage[ngerman]{babel} % for German text only
%\usepackage{ngerman}        % for German text only
\usepackage{mathtools}    %To split equations
\usepackage{amsmath}
\usepackage{esint}
\usepackage{mathdesign}
\usepackage[ansinew]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{rotating}
\usepackage{multirow}
\usepackage{microtype} % improves font spacing, needs pdfTEX >= 1.20
\usepackage{hyperref}  % hyperlinks

\usepackage{graphicx}
\usepackage{subfigure}

\usepackage{makeidx}    
\begin{flalign}
    \frac{\partial}{\partial t}\oiiint \rho dv + \oiint \rho \stackrel{\rightarrow}{V}\cdot \stackrel{\rightarrow}{ss}=0
    \end{flalign}

But I keep getting the error undefined control sequence \oiiint

Can any one help please?

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marked as duplicate by egreg, Joseph Wright Feb 1 at 21:51

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

1  
What's the intended main font of the document? –  egreg Nov 25 '13 at 10:22
    
using \usepackage[charter]{mathdesign} results in an error : ! Latex Error : Command '\circledD' already defined –  user2536125 Nov 25 '13 at 10:34
    
Sorry, I didn't see your last comment. I'm unable to reproduce the last problem you mention, mathdesign does not define a \circledD command. If this is still an issue, boil your code down to a minimal working example (MWE), and update your question. –  Torbjørn T. Jan 24 at 9:40

2 Answers 2

try

\usepackage{mdsymbol}

or use one of the new...math fonts.

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I'm not sure about mdsymbol: it provides symbols designed to accompany sans serif fonts. –  egreg Nov 25 '13 at 8:51

As Tobjorn already mentioned (I am too slow), you can add the charter option to mathdesign:

% arara: pdflatex
\documentclass{scrreprt}
\usepackage{mathtools}
\usepackage{amsmath}
\usepackage{esint}
\usepackage[charter]{mathdesign}

\begin{document}  
\begin{flalign}
\oiiint \rho dv
\end{flalign}
\end{document}

Other possible fonts are listed in the documentation on page 2.

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