\( \DeclareMathOperator{\tr}{tr} \newcommand\D{\mathrm{d}} \newcommand\E{\mathrm{e}} \newcommand\I{\mathrm{i}} \newcommand\bigOh{\mathcal{O}} \newcommand{\cat}[1]{\mathbf{#1}} \newcommand\curl{\vec{\nabla}\times} \newcommand{\CC}{\mathbb{C}} \newcommand{\NN}{\mathbb{N}} \newcommand{\QQ}{\mathbb{Q}} \newcommand{\RR}{\mathbb{R}} \newcommand{\ZZ}{\mathbb{Z}} % For +---- metric \newcommand{\BDpos}{} \newcommand{\BDneg}{-} \newcommand{\BDposs}{\phantom{-}} \newcommand{\BDnegg}{-} \newcommand{\BDplus}{+} \newcommand{\BDminus}{-} % For -+++ metric \newcommand{\BDpos}{-} \newcommand{\BDposs}{-} \newcommand{\BDneg}{} \newcommand{\BDnegg}{\phantom{-}} \newcommand{\BDplus}{-} \newcommand{\BDminus}{+} \)

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<term> is <attribute>

:: A is an attribute of type T
theorem
  ex t being T st t is A;