Pure/library/enclose, Pure/Syntax/pretty/enclose: renamed from parents
Pure/library/is_blank: now handles form feeds () too, in accordance with
ML definition
(* Title: ZF/Order.thy
ID: $Id$
Author: Lawrence C Paulson, Cambridge University Computer Laboratory
Copyright 1994 University of Cambridge
Orders in Zermelo-Fraenkel Set Theory
*)
Order = WF + Perm +
consts
part_ord :: "[i,i]=>o" (*Strict partial ordering*)
linear, tot_ord :: "[i,i]=>o" (*Strict total ordering*)
well_ord :: "[i,i]=>o" (*Well-ordering*)
ord_iso :: "[i,i,i,i]=>i" (*Order isomorphisms*)
pred :: "[i,i,i]=>i" (*Set of predecessors*)
rules
part_ord_def "part_ord(A,r) == irrefl(A,r) & trans[A](r)"
linear_def "linear(A,r) == (ALL x:A. ALL y:A. <x,y>:r | x=y | <y,x>:r)"
tot_ord_def "tot_ord(A,r) == part_ord(A,r) & linear(A,r)"
well_ord_def "well_ord(A,r) == tot_ord(A,r) & wf[A](r)"
ord_iso_def "ord_iso(A,r,B,s) == \
\ {f: bij(A,B). ALL x:A. ALL y:A. <x,y>:r <-> <f`x,f`y>:s}"
pred_def "pred(A,x,r) == {y:A. <y,x>:r}"
end