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Hi Ijon Tichy

here is my sample tex script

\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 ...

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

\begin{equation}
\frac{\partial}{\partial t}\iiintop_{\forall} \rho d\forall
+\oiintop_S \rho \vec ...