ダラッっと語る。$`\newcommand{\In}{\text{ in }} \newcommand{\mrm}[1]{\mathrm{#1} } \newcommand{\cat}[1]{\mathcal{#1} } \newcommand{\mbf}[1]{\mathbf{#1} } %\newcommand{\u}[1]{\underline{#1} } %\newcommand{\Imp}{\Rightarrow} %\newcommand{\If…