deletions | additions       diff --git a/untitled.tex b/untitled.tex  index fa2bfc3..400fbd9 100644  --- a/untitled.tex  +++ b/untitled.tex 
...
\newcommand{\Let}[1]{Let #1 \newcommand{\Let}[2]{\text{Let  } #1 \text{ be #2}}  \begin{subequations}  \begin{align}  \Let{P be the \begin{align*}  \Let{P}{the  set of persons} \end{align} \end{align*}  \end{subequations}