| author | nipkow |
| Sun, 15 Aug 2010 16:48:42 +0200 | |
| changeset 38430 | 254a021ed66e |
| parent 27015 | f8537d69f514 |
| permissions | -rw-r--r-- |
| 15136 | 1 |
theory ToyList |
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imports Datatype |
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begin |
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datatype 'a list = Nil ("[]")
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| Cons 'a "'a list" (infixr "#" 65) |
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38430
254a021ed66e
tuned text about "value" and added note on comments.
nipkow
parents:
27015
diff
changeset
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(* This is the append function: *) |
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primrec app :: "'a list => 'a list => 'a list" (infixr "@" 65) |
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where |
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"[] @ ys = ys" | |
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"(x # xs) @ ys = x # (xs @ ys)" |
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primrec rev :: "'a list => 'a list" where |
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"rev [] = []" | |
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"rev (x # xs) = (rev xs) @ (x # [])" |