$\forall$$T$:Type, $n$:$\mathbb{N}$, $h$, $f$:($T$$\rightarrow$$T$). ($f$$^{\mbox{\scriptsize $n$}}$ o $h$) = primrec($n$;$h$;$\lambda$$i$,$g$. $f$ o $g$) $\in$ $T$$\rightarrow$$T$