## KevinOrr one year ago Please ignore \begin{align} \in(12) = &6 \in(&6) = &4 \in(&4) = 3 \end{align}

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1. KevinOrr

$\in(\color{#ff00ff}{12}) = \color{red}{6} \\ ~~~~~~~~~\in(\color{red}{6}) = \color{blue}{4} \\ ~~~~~~~~~~~~~~~~~\in(\color{blue}{4}) = \color{green}{3}$So, $$\in(\in(\in(\color{#ff00ff}{12})))=\color{green}{3}$$.

2. e.mccormick

You could use a matrix or array to align it. $\begin{matrix} \in ({\color{Magenta} {12}})=& {\color{Red} 6}& & \\ & \in(\color{Red} 6) & = {\color{Blue} 4} & \\ & & \in (\color{Blue}4) & = {\color{DarkGreen} 3} \end{matrix} \\ \begin{array}{rrrr} \in ({\color{Magenta} {12}})&= \color{Red} 6& & \\ & \in({\color{Red} 6}) & = \color{Blue}4 & \\ & & \in (\color{Blue}4) & = {\color{DarkGreen} 3} \end{array}$ Also, for long spaces there is \quad and \qquad a\quad b \qquad c$$\rightarrow a\quad b \qquad c$$