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{{Documentation subpage}}
This template is used to include the double closed integral, usually in a mathematical formula. It overcomes a limitation of the [[Help:数学公式|TeX rendering]] which cannot display this symbol without clumsy workarounds.

==Arguments==

* '''preintegral''' the text or formula immediately before the integral
* '''intsubscpt''' the subscript below the integral
* '''integrand''' the text or formula immediately after the formula

All parameters are optional.

==Examples==

;Two of [[馬克士威方程組|Maxwell's equations]]

<pre><nowiki>{{oiint
| preintegral = <math>\oint_C \bold{E} \cdot {\rm d} \boldsymbol{\ell} = \frac{\partial }{\partial t} </math>
| intsubscpt = <math>{\scriptstyle S}</math>
| integrand = <math>\bold{B} \cdot {\rm d}\bold{S}</math>
}}</nowiki></pre>
 
{{oiint
| preintegral = <math>\oint_C \bold{E} \cdot {\rm d} \boldsymbol{\ell} = \frac{\partial }{\partial t} </math>
| intsubscpt = <math>{\scriptstyle S}</math>
| integrand = <math>\bold{B} \cdot {\rm d}\bold{S}</math>
}}

<pre><nowiki>{{oiint
| preintegral = <math>\oint_C \bold{B} \cdot {\rm d} \boldsymbol{\ell} = \mu_0 </math>
| intsubscpt = <math>{\scriptstyle S}</math>
| integrand = <math>\left ( \bold{J} + \epsilon_0\frac{\partial \bold{E}}{\partial t} \right ) \cdot {\rm d}\bold{S}</math>
}}</nowiki></pre>

{{oiint
| preintegral = <math>\oint_C \bold{B} \cdot {\rm d} \boldsymbol{\ell} = \mu_0 </math>
| intsubscpt = <math>{\scriptstyle S}</math>
| integrand = <math>\left ( \bold{J} + \epsilon_0\frac{\partial \bold{E}}{\partial t} \right ) \cdot {\rm d}\bold{S}</math>
}}

==See also==

* {{tl|Oiiint}}

Oriented boundary integrals over a 2-surface and 3-surface can be implemented by:

* {{tl|intorient}}

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