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$\forall$${\it poss}$:(ES\{i\}$\rightarrow$Prop$_{\mbox{\scriptsize i'}}$), $R$:(possible{-}event\{i:l\}(${\it poss}$)$\rightarrow$possible{-}event\{i:l\}(${\it poss}$)$\rightarrow$Prop$_{\mbox{\scriptsize i'}}$).
\\[0ex](EquivRel $1$,$2$:possible{-}event\{i:l\}(${\it poss}$). $R$($1$,$2$))
\\[0ex]$\Rightarrow$ (\=$\forall$$P$:(possible{-}event\{i:l\}(${\it poss}$)$\rightarrow$Prop$_{\mbox{\scriptsize i'}}$), $e$:possible{-}event\{i:l\}(${\it poss}$).\+
\\[0ex]$\neg$es{-}knows\=\{i:l\}\+
\\[0ex](${\it poss}$; $R$; $P$; $e$)
\-\\[0ex]$\Rightarrow$ es{-}knows\=\{i:l\}\+
\\[0ex](${\it poss}$; $R$; ($\lambda$$e$.$\neg$es{-}knows\{i:l\}(${\it poss}$; $R$; $P$; $e$)); $e$))
\-\-
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