다음과 같은 cases 환경을 사용하세요.
\documentclass{article} \usepackage{amsmath} \begin{document} \begin{equation} D_{it} = \begin{cases} 1 & \text{if bank $i$ issues ABs at time $t$}\\ 2 & \text{if bank $i$ issues CBs at time $t$}\\ 0 & \text{otherwise} \end{cases} \end{equation} \end{document}
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