inductive li (M) (gv): relation2 lenv (evaluation M) ≝
| li_atom: ∀lv. li M gv (⋆) lv
-| li_abbr: ∀lv,d,L,V. li M gv L lv → ⟦V⟧[gv, lv] = d → li M gv (L.ⓓV) (⫯[0←d]lv)
+| li_abbr: ∀lv,d,L,V. li M gv L lv → ⟦V⟧[gv,lv] = d → li M gv (L.ⓓV) (⫯[0←d]lv)
| li_abst: ∀lv,d,L,W. li M gv L lv → li M gv (L.ⓛW) (⫯[0←d]lv)
| li_unit: ∀lv,d,I,L. li M gv L lv → li M gv (L.ⓤ{I}) (⫯[0←d]lv)
| li_veq : ∀lv1,lv2,L. li M gv L lv1 → lv1 ≗ lv2 → li M gv L lv2
| #lv1 #d #K #V #_ #Hd #IH #gv2 #Hgv #lv2 #Hlv destruct
@li_veq [2: /4 width=4 by li_abbr, veq_refl/ | skip ] -IH
@(veq_canc_sn … Hlv) -Hlv //
- /4 width=1 by ti_comp, vlift_comp, (* 2x *) veq_refl/
+ /4 width=1 by ti_comp, vpush_comp, (* 2x *) veq_refl/
| #lv1 #d #K #W #_ #IH #gv2 #Hgv #lv2 #Hlv
@li_veq /4 width=3 by li_abst, veq_refl/
| #lv1 #d #I #K #_ #IH #gv2 #Hgv #lv2 #Hlv