agda style
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@ -35,7 +35,8 @@ open import plfa.part2.Untyped
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using (Context; _,_; ★; _∋_; _⊢_; `_; ƛ_; _·_)
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open import plfa.part3.Denotational
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using (Value; _↦_; _`,_; _⊔_; ⊥; _⊑_; _⊢_↓_;
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⊑-bot; ⊑-fun; ⊑-conj-L; ⊑-conj-R1; ⊑-conj-R2; ⊑-dist; ⊑-refl; ⊑-trans; ⊔↦⊔-dist;
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⊑-bot; ⊑-fun; ⊑-conj-L; ⊑-conj-R1; ⊑-conj-R2;
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⊑-dist; ⊑-refl; ⊑-trans; ⊔↦⊔-dist;
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var; ↦-intro; ↦-elim; ⊔-intro; ⊥-intro; sub;
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up-env; ℰ; _≃_; ≃-sym; Denotation; Env)
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open plfa.part3.Denotational.≃-Reasoning
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@ -308,8 +309,7 @@ To round-out the semantic equations, we establish the following one
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for variables.
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```
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var-equiv : ∀{Γ}{x : Γ ∋ ★}
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→ ℰ (` x) ≃ (λ γ v → v ⊑ γ x)
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var-equiv : ∀{Γ}{x : Γ ∋ ★} → ℰ (` x) ≃ (λ γ v → v ⊑ γ x)
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var-equiv γ v = ⟨ var-inv , (λ lt → sub var lt) ⟩
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```
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@ -507,8 +507,7 @@ straightforward induction, using the three equations
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with the congruence lemmas for `ℱ` and `●`.
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```
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ℰ≃⟦⟧ : ∀ {Γ} {M : Γ ⊢ ★}
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→ ℰ M ≃ ⟦ M ⟧
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ℰ≃⟦⟧ : ∀ {Γ} {M : Γ ⊢ ★} → ℰ M ≃ ⟦ M ⟧
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ℰ≃⟦⟧ {Γ} {` x} = var-equiv
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ℰ≃⟦⟧ {Γ} {ƛ N} =
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let ih = ℰ≃⟦⟧ {M = N} in
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