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doc-src/Tutorial/Datatype/abevala
author wenzelm
Tue, 09 Mar 1999 12:20:22 +0100
changeset 6332 7cee353c7f2a
parent 5851 15ce4c1c8313
permissions -rw-r--r--
Present.theory_source;
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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"
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