I'm trying to stack two symbols on top of each other (not \stackrel) using \mathclap in the mathtools package, but the symbols are not centering:


How do I get the circle in the center of the arrows?


This is a job for \ooalign:


Now with

$a\circrlh b_{\circrlh}$

you get the following result.

enter image description here

See this answer for a quick course on \ooalign

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