(* Title: HOL/Corec_Examples/Tests/Merge_A.thy
Author: Aymeric Bouzy, Ecole polytechnique
Author: Jasmin Blanchette, Inria, LORIA, MPII
Copyright 2015, 2016
Tests theory merges.
*)
section \<open>Tests Theory Merges\<close>
theory Merge_A
imports "HOL-Library.BNF_Corec"
begin
codatatype 'a ta = Ca (sa1: 'a) (sa2: "'a ta")
consts gb :: "'a ta \<Rightarrow> 'a ta"
corec fa where
"fa = Ca (Suc 0) fa"
corec ga :: "'a ta \<Rightarrow> 'a ta" where
"ga t = Ca (sa1 t) (sa2 t)"
friend_of_corec ga :: "'a ta \<Rightarrow> 'a ta" where
"ga t = Ca (sa1 t) (Ca (sa1 t) (sa2 t))"
sorry
thm ta.coinduct_upto
thm ta.cong_refl
end