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consts\\
\>Ball\>::\ "\mbox{$\alpha$}\ set\ \mbox{$\Rightarrow$}\ (\mbox{$\alpha$}\ \mbox{$\Rightarrow$}\ bool)\ \mbox{$\Rightarrow$}\ bool"\\
syntax\\
\>"@Ball"\>::\ "pttrn\ \mbox{$\Rightarrow$}\ \mbox{$\alpha$}\ set\ \mbox{$\Rightarrow$}\ bool\ \mbox{$\Rightarrow$}\ bool"\>\>\>\>\>("(3\mbox{$\forall$}\_\mbox{$\in$}\_./\ \_)"\ 10)\\
translations\\
\>\>"\mbox{$\forall$}x\mbox{$\in$}A.\ P"\ \mbox{$\equiv$}\ "Ball\ A\ (\mbox{$\lambda$}x.\ P)"\\
defs\\
\ \ \ \ \ Ball\_def\>\>"Ball\ A\ P\ \mbox{$\equiv$}\ \mbox{$\forall$}x.\ x\mbox{$\in$}A\ \mbox{$\longrightarrow$}\ P\ x"\\
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