$\forall$$T$:Type, $R_{1}$, $R_{2}$:($T$$\rightarrow$$T$$\rightarrow\mathbb{P}$). ($R_{1}$ $\equiv>$\{$T$\} $R_{2}$) $\Rightarrow$ (($R_{1}$$^{\mbox{\scriptsize $\ast$}}$) $\equiv>$\{$T$\} ($R_{2}$$^{\mbox{\scriptsize $\ast$}}$))