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$\forall$\=$A$, $C$:Type, $B$:($A$$\rightarrow$Type), ${\it eqa}$:EqDecider($A$), ${\it eqc}$:EqDecider($C$), $r$:($A$$\rightarrow$$C$), $f$:$a$:$A$ fp$\rightarrow$ $B$($a$),\+
\\[0ex]$a$:$A$.
\-\\[0ex]Inj($A$;$C$;$r$) $\Rightarrow$ ($\uparrow$$a$ $\in$ dom($f$)) $\Rightarrow$ (rename($r$;$f$)($r$($a$)) = $f$($a$) $\in$ $B$($a$))
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