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How do I write the symbol for closed surface integrals? I need a contour double integral. $$ \oiint $$

It doesn't seem to work... only for singles: $$ \oint $$

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    $\begingroup$ As this is a rare symbol it might not be available in MathJax. $\endgroup$ – quid Feb 10 '15 at 21:30
  • $\begingroup$ @quid: Well done. $\endgroup$ – Asaf Karagila Feb 10 '15 at 21:40

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