Ring integral with latex could not show

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$$
\oiint_{\partial \Omega}{\boldsymbol{E}\cdot \mathrm{d}s}=\frac{Q}{\varepsilon _0}\
$$

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I know next to nothing about MathJax, but perhaps it’s not supported? There are links to documentation here: https://help.obsidian.md/Editing+and+formatting/Advanced+formatting+syntax#Math

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Would the following be of any worth for you?

$$
 {\huge\unicode{x222F}}_S   \qquad   {\huge\unicode{x2230}}_V
$$

Found this workaround here talking about some extensions/future stuff in MathJax.

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