$\forall$$T$:Type, $R$, ${\it R'}$:($T$$\rightarrow$$T$$\rightarrow\mathbb{P}$), $f$:($T$$\rightarrow$$T$).
\\[0ex]($\forall$$x$, $y$:$T$. $R$($x$,$y$) $\Leftarrow\!\Rightarrow$ ${\it R'}$($x$,$y$)) $\Rightarrow$ (monot($T$;$x$,$y$.$R$($x$,$y$);$f$) $\Leftarrow\!\Rightarrow$ monot($T$;$x$,$y$.${\it R'}$($x$,$y$);$f$))