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doc-src/Tutorial/Datatype/abevala
author paulson
Fri, 14 May 2004 16:52:53 +0200
changeset 14748 001323d6d75b
parent 5851 15ce4c1c8313
permissions -rw-r--r--
removed a premise of card_inj_on_le
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15ce4c1c8313 New section on advanced datatypes.
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primrec
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  "evala env (IF b a1 a2) =
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     (if evalb env b then evala env a1 else evala env a2)"
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  "evala env (Sum a1 a2) = evala env a1 + evala env a2"
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  "evala env (Diff a1 a2) = evala env a1 - evala env a2"
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  "evala env (Var v) = env v"
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  "evala env (Num n) = n"
isabelle