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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
\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{microtype} % improves font spacing, needs pdfTEX >= 1.20
\usepackage{hyperref}  % hyperlinks


    \frac{\partial}{\partial t}\oiiint \rho dv + \oiint \rho \stackrel{\rightarrow}{V}\cdot \stackrel{\rightarrow}{ss}=0

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 '14 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.

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 '14 at 9:40
This seems rather to be a duplicate of How to insert a triple line integral? - where the best answer is write-math.com :-) – Martin Thoma May 21 '15 at 18:43



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

\oiiint \rho dv

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

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