--- a/src/HOL/IMP/Live.thy Tue Mar 12 11:59:26 2013 +0100
+++ b/src/HOL/IMP/Live.thy Tue Mar 12 19:55:17 2013 +0100
@@ -7,12 +7,14 @@
subsection "Liveness Analysis"
+text_raw{*\snip{LDef}{0}{2}{% *}
fun L :: "com \<Rightarrow> vname set \<Rightarrow> vname set" where
-"L SKIP X = X" |
-"L (x ::= a) X = X-{x} \<union> vars a" |
-"L (c\<^isub>1; c\<^isub>2) X = (L c\<^isub>1 \<circ> L c\<^isub>2) X" |
+"L SKIP X = X" |
+"L (x ::= a) X = (X - {x}) \<union> vars a" |
+"L (c\<^isub>1; c\<^isub>2) X = (L c\<^isub>1 \<circ> L c\<^isub>2) X" |
"L (IF b THEN c\<^isub>1 ELSE c\<^isub>2) X = vars b \<union> L c\<^isub>1 X \<union> L c\<^isub>2 X" |
-"L (WHILE b DO c) X = vars b \<union> X \<union> L c X"
+"L (WHILE b DO c) X = vars b \<union> X \<union> L c X"
+text_raw{*}%endsnip*}
value "show (L (''y'' ::= V ''z''; ''x'' ::= Plus (V ''y'') (V ''z'')) {''x''})"