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gf-core/old-examples/systemS/Formula.gf

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-- 20 Dec 2005, 9.45
abstract Formula = {
cat
Formula ;
Term ;
fun
And, Or, If : (_,_ : Formula) -> Formula ;
Not : Formula -> Formula ;
Abs : Formula ;
---- All, Exist : (Term -> Formula) -> Formula ;
-- to test
A, B, C : Formula ;
}