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How do I put a circle around an operator?

Is there a symbol for a circled intersection sign? or an alternative way to render something like in the image below? Something like \oplus for the plus sign. I need to use this symbol inside a math environment as a sub index.

The result I am expecting is something like this: enter image description here

But with this symbol enter image description here instead.

marked as duplicate by user11232, lockstep, Jake, Gonzalo Medina, clemens Aug 20 '12 at 17:11

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.


Ther is certainly a duplicate/related of this question which I can't find right now. For the time being I am posting this tikz solution.

%% Code borrowed from Altermundus http://tex.stackexchange.com/questions/53698/
\newcommand{\ointersection}[1]{\tikz[baseline=(X.base), inner sep=0, outer sep=0]\node[draw,circle] (X) {$#1\cap$};}

\[m^{\Omega}_{i\myointersection j}\left(H\right)\]

enter image description here

  • Thanks for the answer. Sadly, it doesn't render very pretty when used as a subindex... it is to big. – Felipe Aguirre Aug 20 '12 at 16:13
  • @FelipeAguirre: This is not designed for a sub index. The duplicate I mentioned, (If you can find it) can be used for such things. – user11232 Aug 20 '12 at 16:19
  • Can you please give me some clues or keywords to search for the other question? – Felipe Aguirre Aug 20 '12 at 16:26
  • @FelipeAguirre: See this How do I put a circle around an operator? – user11232 Aug 20 '12 at 16:42
  • Using TikZ to create math operators might lead to inconvenient processing times when the document gets longer. In addition, you should adapt line thickness to math style to better match the operator strokes. – Stephan Lehmke Aug 20 '12 at 17:19

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