\documentclass{article}

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\usepackage{amsmath}
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\title{}
\author{}

\date{}
\begin{document}
\maketitle


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\[
\begin{array}{@{\hspace{5pt}}l}
\forall 
\hspace*{5pt}
\mbox{\em rel}_{\mbox{\scriptsize\em fe}}
^{
\mathsf{Keep}
}
\hspace*{5pt}
{\scriptscriptstyle \in}
\hspace*{5pt}
\mathtt{getAllFERelations}
\left(
\mathtt{fnDB}
\right)
\hspace*{5pt}
\bullet 
\\
\begin{array}{@{\hspace{1pt}}l@{\hspace{1pt}}}
\mathtt{target}
\left(
\mbox{\em rel}_{\mbox{\scriptsize\em fe}}
\right)
\not= 
\hspace*{2pt}
\mathsf{0}
\\
\wedge 
\\
\left(
\begin{array}{@{\hspace{1pt}}l@{\hspace{1pt}}}
\mathtt{target}
\left(
\mbox{\em rel}_{\mbox{\scriptsize\em fe}}
\right)
= 
\hspace*{2pt}
\mathsf{0}
\\
\vee 
\\
\neg 
\hspace*{2pt}
\begin{array}{@{\hspace{1pt}}l@{\hspace{1pt}}}
\mathtt{null}
\left(
\begin{array}{@{\hspace{1pt}}l@{\hspace{1pt}}}
\mathtt{getFEByID}
\left(
\mathtt{fnDB}
,
\mathtt{target}
\left(
\mbox{\em rel}_{\mbox{\scriptsize\em fe}}
\right)
\right)
\\
\end{array}
\right)
\\
\\
\end{array}
\\
\end{array}
\right)
\\
\end{array}
\\
\end{array}
\]
\end{document}
