Interior of Set Notation

Question

I would like to denote the interior of a set using the three letters "int". However, $\int$ clearly doesn't work as that is the integral sign. I would like it to look similar to how "min" looks when typing $\min$ in latex.

Answer 1

This should do it.

\documentclass{scrartcl}
\usepackage{amsmath}

\DeclareMathOperator{\interior}{int}

\begin{document}

\begin{align*}
    \interior A&\\
    \exp A&\\
    \interior(A)&\\
    \exp(A)&\\
    \interior\Bigl(A\Bigr)&\\
    \exp\Bigl(A\Bigr)&
\end{align*}

\end{document}

The package https://ctan.org/pkg/amsopn is part of https://ctan.org/pkg/amsmath. The manual at https://ctan.org/pkg/short-math-guide might be useful for you, for example section 3.15. It is also found on page 48 of https://ctan.org/pkg/lshort-english. A discussion on manuals is found in What are good learning resources for a LaTeX beginner?.