(* Title: HOL/HOLCF/FOCUS/FOCUS.thy
Author: David von Oheimb, TU Muenchen
*)
section \<open>Top level of FOCUS\<close>
theory FOCUS
imports Fstream
begin
lemma ex_eqI [intro!]: "? xx. x = xx"
by auto
lemma ex2_eqI [intro!]: "? xx yy. x = xx & y = yy"
by auto
lemma eq_UU_symf: "(UU = f x) = (f x = UU)"
by auto
lemma fstream_exhaust_slen_eq: "(#x ~= 0) = (? a y. x = a~> y)"
by (simp add: slen_empty_eq fstream_exhaust_eq)
lemmas [simp] =
slen_less_1_eq fstream_exhaust_slen_eq
slen_fscons_eq slen_fscons_less_eq Suc_ile_eq
declare strictI [elim]
end