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How can I get a black \mathring circle above variable, same as \mathring except the circle is "filled"?

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possible duplicate of How to put a big dot (and circle) over a variable? – Caramdir May 17 '11 at 5:29
@Caradir: the bullet as accent is too big! – dearmath May 19 '11 at 3:19

Only the Latin Modern fonts allow for fonts smaller than 5pt (other scalable font families should not need the change of family)



A more general definition might be

  \hbox{\fontfamily{lmr}\fontsize{.4\dimexpr(\f@size pt)}{0}\selectfont\textbullet}}

enter image description here

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The placement is clearly not very satisfied compared to \mathring. But I think is the a solution with minimal dependence on availability of fonts. Better solutions will depend on font packages specific commands.

enter image description here

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Would \dot{x} do?

enter image description here

doesn't need any packages as fat as I know.

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