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(* Title: HOL/Corec_Examples/Tests/Merge_D.thy
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62696
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Author: Aymeric Bouzy, Ecole polytechnique
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Author: Jasmin Blanchette, Inria, LORIA, MPII
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Copyright 2015, 2016
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Tests theory merges.
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*)
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62726
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section \<open>Tests Theory Merges\<close>
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theory Merge_D
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imports Merge_B Merge_C
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begin
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thm ta.coinduct_upto
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(* Merges files having defined their own friends and uses these friends to
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define another corecursive function. *)
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corec gd where
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"gd = fc (gc (gb (fb (ga (Ca 0 gd)))))"
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thm gd_def
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term fc
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corec hd :: "('a::zero) ta \<Rightarrow> 'a ta" where
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"hd s = fc (gc (gb (fb (ga (Ca 0 (hd s))))))"
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friend_of_corec hd where
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"hd s = Ca 0 (fc (gc (gb (fb (ga (Ca 0 (hd s)))))))"
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sorry
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corecursive (friend) ff :: "'a ta \<Rightarrow> 'a ta" where
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"ff x = Ca undefined (ff x)"
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sorry
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thm ta.cong_intros
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thm ta.cong_gb
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end
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