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$\forall$\=${\it poss}$:(ES\{i\}$\rightarrow\mathbb{P}$\{i'\}), $R$:(possible{-}event\{i:l\}(${\it poss}$)$\rightarrow$possible{-}event\{i:l\}(${\it poss}$)$\rightarrow\mathbb{P}$\{i'\}), $P$,\+
\\[0ex]$Q$:(possible{-}event\{i:l\}(${\it poss}$)$\rightarrow\mathbb{P}$\{i'\}).
\-\\[0ex]($\forall$$e$:possible{-}event\{i:l\}(${\it poss}$). ($P$($e$)) $\Rightarrow$ ($Q$($e$)))
\\[0ex]$\Rightarrow$ \=($\forall$$e$:possible{-}event\=\{i:l\}\+\+
\\[0ex](${\it poss}$).
\-\\[0ex]es{-}knows\{i:l\}(${\it poss}$; $R$; $P$; $e$) $\Rightarrow$ es{-}knows\{i:l\}(${\it poss}$; $R$; $Q$; $e$))
\-
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