Used THEN_ALL_NEW.
(* Title: HOLCF/Discrete0.ML
ID: $Id$
Author: Tobias Nipkow
Copyright 1997 TUM
Proves that 'a discr is a po
*)
goalw thy [less_discr_def] "(x::('a::term)discr) << x";
by (rtac refl 1);
qed "less_discr_refl";
goalw thy [less_discr_def]
"!!x. [| (x::('a::term)discr) << y; y << z |] ==> x << z";
by (etac trans 1);
by (assume_tac 1);
qed "less_discr_trans";
goalw thy [less_discr_def]
"!!x. [| (x::('a::term)discr) << y; y << x |] ==> x=y";
by (assume_tac 1);
qed "less_discr_antisym";