Quick question: what's the $\LaTeX$ symbol for the closed surface integral?

Question

anonymous · Answer

$$
\oint ?
$$
It'd be \oint

across · Answer

That's the closed line integral.

anonymous · Answer

sub.s S ?

anonymous · Answer

Yeah, it's the double. That's what I'm trying to remember...

anonymous · Answer

$$\oint _{S}$$

anonymous · Answer

No, most people make it:
$$
\oint\oint
$$There's no standard LaTeX way to do it, you need a package called wasysym, that makes it: \oiint

across · Answer

How can I invoke packages here? I tried using \usepackage{wasysym}, but it does not work.

anonymous · Answer

No, you cannot do it on here, since I don't think the $\LaTeX$ compiler parses it.

anonymous · Answer

Simply do something like:
$$
\underbrace{\oint\oint}_\textrm{Surface}
$$\underbrace{\oint\oint}_\textrm{Surface}

You're kind of limited in this case... but you could add this to the Feedback Page.

across · Answer

This is the best hack-and-slash approach I could find:$$\iint_S\!\!\!\!\!\!\!\!\!\!\!\!\!\!\;\;\;\bigcirc$$But it sucks.

across · Answer

I like what you did.

anonymous · Answer

you can always get maple look at its symbols there and  convert to latex there.

parthkohli · Answer

I always tend to find symbols by $\textbf{drawing}$ them: http://detexify.kirelabs.org/classify.html

across · Answer

@ParthKohli, what an insanely useful link. Bookmarked! Thank you. :)