--- a/src/HOL/IMP/VC.thy Tue May 05 17:28:22 1998 +0200
+++ b/src/HOL/IMP/VC.thy Wed May 06 11:46:00 1998 +0200
@@ -23,7 +23,7 @@
primrec awp acom
"awp Askip Q = Q"
- "awp (Aass x a) Q = (%s. Q(s[a s/x]))"
+ "awp (Aass x a) Q = (%s. Q(s[x:=a s]))"
"awp (Asemi c d) Q = awp c (awp d Q)"
"awp (Aif b c d) Q = (%s. (b s-->awp c Q s) & (~b s-->awp d Q s))"
"awp (Awhile b I c) Q = I"
@@ -46,7 +46,7 @@
(* simultaneous computation of vc and awp: *)
primrec vcawp acom
"vcawp Askip Q = (%s. True, Q)"
- "vcawp (Aass x a) Q = (%s. True, %s. Q(s[a s/x]))"
+ "vcawp (Aass x a) Q = (%s. True, %s. Q(s[x:=a s]))"
"vcawp (Asemi c d) Q = (let (vcd,wpd) = vcawp d Q;
(vcc,wpc) = vcawp c wpd
in (%s. vcc s & vcd s, wpc))"