src/HOL/Trancl.thy

updated version number to revision 4

(*  Title: 	HOL/trancl.thy
    ID:         $Id$
    Author: 	Lawrence C Paulson, Cambridge University Computer Laboratory
    Copyright   1992  University of Cambridge

Relfexive and Transitive closure of a relation

rtrancl is refl&transitive closure;  trancl is transitive closure
*)

Trancl = Lfp + Relation + 
consts
    rtrancl :: "('a * 'a)set => ('a * 'a)set"	("(_^*)" [100] 100)
    trancl  :: "('a * 'a)set => ('a * 'a)set"	("(_^+)" [100] 100)  
defs   
rtrancl_def	"r^* == lfp(%s. id Un (r O s))"
trancl_def	"r^+ == r O rtrancl(r)"
end