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consts
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Ball :: "'a set => ('a => bool) => bool"
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syntax
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"@Ball" :: "pttrn => 'a set => bool => bool" ("(3!_:_./ _)" 10)
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translations
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"!x:A. P" == "Ball A (%x. P)"
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defs
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Ball_def "Ball A P == !x. x:A --> P x"
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