diff -r 722bf1319be5 -r fd1be45b64bf IOA/meta_theory/Solve.thy
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/IOA/meta_theory/Solve.thy	Wed Nov 02 11:50:09 1994 +0100
@@ -0,0 +1,20 @@
+(* Methods of proof for IOA. *)
+
+Solve = IOA +
+
+consts
+
+  is_weak_pmap :: "['c => 'a, ('action,'c)ioa,('action,'a)ioa] => bool"
+
+rules
+
+is_weak_pmap_def
+  "is_weak_pmap(f,C,A) ==                           \
+\   (!s:starts_of(C). f(s):starts_of(A)) &        \
+\   (!s t a. reachable(C,s) &                       \
+\            <s,a,t>:trans_of(C)                    \
+\            --> if(a:externals(asig_of(C)),        \
+\                   <f(s),a,f(t)>:trans_of(A),      \
+\                   f(s)=f(t)))"
+
+end