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doc-src/Tutorial/Datatype/absubsta
author nipkow
Tue, 08 Apr 2003 09:05:39 +0200
changeset 13903 ad1c28671a93
parent 5851 15ce4c1c8313
permissions -rw-r--r--
First working version

primrec
  "substa s (IF b a1 a2) =
     IF (substb s b) (substa s a1) (substa s a2)"
  "substa s (Sum a1 a2) = Sum (substa s a1) (substa s a2)"
  "substa s (Diff a1 a2) = Diff (substa s a1) (substa s a2)"
  "substa s (Var v) = s v"
  "substa s (Num n) = Num n"
isabelle