Math & Science ⇒ problem with closed volume integral in latex

[abrarn17]

Hello everyone

I am having problem with closed volume integral in latex
i used \oiint for surface integral its working perfectly but \oiiint is not working in my compilation.

my latex syntax is

Code: Select all

\begin{equation}
\frac{\partial}{\partial t}\iiintop_{\forall} \rho d\forall 
+\oiintop_S \rho \vec{V}.\vec{dS}=0
\end{equation}

What i am getting is

I am getting this

z1.png (25 KiB) Viewed 9512 times

what i expect

I expect this to come

z2.png (12.63 KiB) Viewed 9512 times

Thanks

[Ijon Tichy]

What do you mean with: “\oiiint is not working”? Have you loaded one of the packages, that provide \oiiint (→ symbols-a4)?

Can you please show a minimal working example to make your problem reproducible? And can you please use code tags to mark code? Otherwise the online editor/compiler provided by latex.org would not be activated.

[abrarn17]

Hi Ijon Tichy

here is my sample tex script

Code: Select all

\documentclass[a4paper,12pt,twoside]{book}
%\documentclass[12pt,a4paper]{exam}
\usepackage{blindtext}
\usepackage[T1]{fontenc}
\usepackage{array}
\usepackage{booktabs}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\pagestyle{headings}
\usepackage{enumitem}
\usepackage[dvipsnames]{xcolor}
\usepackage{graphicx}
\usepackage{amsmath,amssymb}
\usepackage{wasysym}
\usepackage{amsmath,esint}
\usepackage[supplier-typeface]{mathdesign}
\makeatletter
\newcommand{\mathleft}{\@fleqntrue\@mathmargin0pt}
\newcommand{\mathcenter}{\@fleqnfalse}
\makeatother
\usepackage[makeroom]{cancel}

\usepackage{xcolor}
\colorlet{RED}{red}
\protected\def\myred{\color{red}}
\usepackage[dvipsnames]{xcolor}
\usepackage[skins,theorems]{tcolorbox}
\usepackage[export]{adjustbox}
\usepackage[margin=0.875in]{geometry}
\usepackage{amssymb,amsfonts,bm}
\usepackage{subfigure,float,multirow}

\begin{document}

\begin{equation}
 %\oiintop_S  p \vec{dS} = \iiint_V \nabla p d{\forall}
 \oiintop_S  p \vec{dS} = \oiiint_V \nabla p d{\forall}
\end{equation}

\end{document}

[Ijon Tichy]

This is far from being minimal. However, it seems you are not loading one of the packages, that provide \oiiint. See the linked document in my previous posting for more information about the alternatives of those packages.

BTW: subfigure is deprecated for decades and should not be used any longer. See the link for alternatives.

And you should not load packages more than once. It is not a fault, but it often results in an fault, e.g., if options are changed at one loading but not at the other.

[vaman]

I think this will be a useful to generate the integral you want. I ran it and it worked.
I can not paste the image as it is in pdf format. Here is my answer.

Code: Select all

\documentclass{article}
\usepackage{amsmath}
\usepackage{tikz}
\usetikzlibrary{shapes}
\newcommand*\oiint{%
	\tikz \node[draw, ellipse, inner xsep=-3pt, inner ysep=-9pt] {$\displaystyle\iint$};%
}
\newcommand*\oiiint{%
	\tikz \node[draw, ellipse, inner xsep=-4pt, inner ysep=-9pt] {$\displaystyle\iiint$};%
}
\begin{document}
\begin{eqnarray}
\frac{\partial}{\partial t} {\underset {V} {\oiiint}} \rho dv+ {\underset{S} {\oiint}} \rho \vec{V} \cdot \vec{ds}\\
  V \;\;\;\;\;\;\;\;\;\;\;\;\;\; S\;\;\;\;\;\;\;\;\;\;\;\;\;\ \nonumber
\end{eqnarray}
\end{document}

Here the position of V and S can be suitably adjusted. I hope it works for you.