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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.

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marked as duplicate by Harish Kumar, lockstep, Jake, Gonzalo Medina, cgnieder 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.

1 Answer

up vote 1 down vote accepted

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.

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

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

enter image description here

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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. –  Harish Kumar 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? –  Harish Kumar Aug 20 '12 at 16:42
    
Thank you!! it works just fine –  Felipe Aguirre Aug 20 '12 at 17:05
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