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-rw-r--r--src/Cfe/Language/Base.agda7
1 files changed, 7 insertions, 0 deletions
diff --git a/src/Cfe/Language/Base.agda b/src/Cfe/Language/Base.agda
index a3b5136..71ee7df 100644
--- a/src/Cfe/Language/Base.agda
+++ b/src/Cfe/Language/Base.agda
@@ -63,6 +63,13 @@ record _≈_ {a b} (A : Language a) (B : Language b) : Set (c ⊔ ℓ ⊔ a ⊔
f : ∀ {l} → l ∈ A → l ∈ B
f⁻¹ : ∀ {l} → l ∈ B → l ∈ A
+record _<_ {a b} (A : Language a) (B : Language b) : Set (c ⊔ ℓ ⊔ a ⊔ b) where
+ field
+ f : ∀ {l} → l ∈ A → l ∈ B
+ l : List C
+ l∉A : l ∉ A
+ l∈B : l ∈ B
+
null : ∀ {a} → Language a → Set a
null A = [] ∈ A