changeset 47269 | 29aa0c071875 |
child 47302 | 70239da25ef6 |
47268:262d96552e50 | 47269:29aa0c071875 |
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1 theory MyList |
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2 imports Main |
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3 begin |
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4 |
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5 datatype 'a list = Nil | Cons "'a" "('a list)" |
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6 |
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7 fun app :: "'a list => 'a list => 'a list" where |
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8 "app Nil ys = ys" | |
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9 "app (Cons x xs) ys = Cons x (app xs ys)" |
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10 |
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11 fun rev :: "'a list => 'a list" where |
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12 "rev Nil = Nil" | |
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13 "rev (Cons x xs) = app (rev xs) (Cons x Nil)" |
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14 |
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15 value "rev(Cons True (Cons False Nil))" |
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16 |
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17 end |