(* Title: HOL/IOA/Solve.thy
ID: $Id$
Author: Tobias Nipkow & Konrad Slind
Copyright 1994 TU Muenchen
*)
header {* Weak possibilities mapping (abstraction) *}
theory Solve
imports IOA
begin
constdefs
is_weak_pmap :: "['c => 'a, ('action,'c)ioa,('action,'a)ioa] => bool"
"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)) then
(f(s),a,f(t)):trans_of(A)
else f(s)=f(t)))"
ML {* use_legacy_bindings (the_context ()) *}
end