$\forall$$A$:Type, ${\it eq}$:EqDecider($A$), $f$:$a$:$A$ fp$\rightarrow$ Top, $L$:$A$ List.
\\[0ex]l\_disjoint($A$;1of($f$);$L$) $\Leftrightarrow$ ($\forall$$a$:$A$. $a$ $\in$ dom($f$) $\Rightarrow$ $\neg$($a$ $\in$ $L$))