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doc-src/Tutorial/Datatype/absubsta
author paulson
Mon, 19 Jul 1999 15:29:30 +0200
changeset 7034 99e012d61eef
parent 5851 15ce4c1c8313
permissions -rw-r--r--
new theorem zless_zero_nat

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