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What is code of this line below related to the interior and the closure of A in D? Thank you enter image description here

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    \mathring{A} and \overline{A} – egreg Nov 20 '18 at 8:24
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    Better \newcommand*\interior[1]{\mathring{#1}} and \newcommand*\closure[1]{\overline{#1}} (or \bar{#1}) and then use \interior{A} and \closure{A}. – Manuel Nov 20 '18 at 11:33
  • @Manuel Care to write up an answer to get this off the unanswered list? – Troy Dec 25 '18 at 21:19
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\newcommand*\interior[1]{\mathring{#1}}
\newcommand*\closure[1]{\overline{#1}} % (or \bar{#1})

and then use \interior{A} and \closure{A}.

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