- | thin_refl: ∀L. thin L 0 0 L
- | thin_thin: ∀L1,L2,I,V,e.
- thin L1 0 e L2 → thin (L1. ♭I V) 0 (e + 1) L2
- | thin_skip: ∀L1,L2,I,V1,V2,d,e.
- thin L1 d e L2 → L1 ⊢ ↓[d,e] V1 ≡ V2 →
- thin (L1. ♭I V1) (d + 1) e (L2. ♭I V2)
+| thin_refl: ∀L. thin L 0 0 L
+| thin_thin: ∀L1,L2,I,V,e. thin L1 0 e L2 → thin (L1. 𝕓{I} V) 0 (e + 1) L2
+| thin_skip: ∀L1,L2,I,V1,V2,d,e.
+ thin L1 d e L2 → L1 ⊢ ↓[d,e] V1 ≡ V2 →
+ thin (L1. 𝕓{I} V1) (d + 1) e (L2. 𝕓{I} V2)