# Symbol of interior and closure in mathmode

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

• \mathring{A} and \overline{A} – egreg Nov 20 '18 at 8:24
• @Manuel Care to write up an answer to get this off the unanswered list? – Troy Dec 25 '18 at 21:19

\newcommand*\interior[1]{\mathring{#1}}

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