Unfortunately MathJax doesn't know about \oiint and \oiiint, leading me to nasty hacks like \bigcirc \hspace{-1.3em} \int \hspace{-.8em} \int. I'm not comfortable with the magic numbers (which only works for displaymath anyway), so
How to typeset closed multidimensional integral signs with MathJax such that it renders correctly in either math mode?
\oiintin MathJaX but it doesn't have the right symbol, so I'm looking for ideas as to how to fake it. Suppose you didn't have that symbol available in TeX but only (say) the AMSMath symbols. How would you build\oiintso that it worked in both display and inline maths?" – Andrew Stacey Nov 7 '12 at 10:14\mathop{\unicode{x222F}}– David Carlisle Nov 7 '12 at 10:40\mathop{\unicode{x2230}}– Tobias Kienzler Nov 7 '12 at 11:01