| vpushs_atom: vpushs M gv lv (⋆) lv
| vpushs_abbr: ∀v,d,K,V. vpushs M gv lv K v → ⟦V⟧[gv,v] = d → vpushs M gv lv (K.ⓓV) (⫯[0←d]v)
| vpushs_abst: ∀v,d,K,V. vpushs M gv lv K v → vpushs M gv lv (K.ⓛV) (⫯[0←d]v)
-| vpushs_unit: ∀v,d,I,K. vpushs M gv lv K v → vpushs M gv lv (K.ⓤ{I}) (⫯[0←d]v)
+| vpushs_unit: ∀v,d,I,K. vpushs M gv lv K v → vpushs M gv lv (K.ⓤ[I]) (⫯[0←d]v)
| vpushs_repl: ∀v1,v2,L. vpushs M gv lv L v1 → v1 ≗ v2 → vpushs M gv lv L v2
.
fact vpushs_inv_unit_aux (M) (gv) (lv): is_model M →
∀y,L. L ⨁{M}[gv] lv ≘ y →
- ∀I,K. K.ⓤ{I} = L →
+ ∀I,K. K.ⓤ[I] = L →
∃∃v,d. K ⨁[gv] lv ≘ v & ⫯[0←d]v ≗ y.
#M #gv #lv #HM #y #L #H elim H -y -L
[ #Z #Y #H destruct
qed-.
lemma vpushs_inv_unit (M) (gv) (lv): is_model M →
- ∀y,I,K. K.ⓤ{I} ⨁{M}[gv] lv ≘ y →
+ ∀y,I,K. K.ⓤ[I] ⨁{M}[gv] lv ≘ y →
∃∃v,d. K ⨁[gv] lv ≘ v & ⫯[0←d]v ≗ y.
/2 width=4 by vpushs_inv_unit_aux/ qed-.
(* Basic forward lemmas *****************************************************)
lemma vpushs_fwd_bind (M) (gv) (lv): is_model M →
- ∀y,I,K. K.ⓘ{I} ⨁{M}[gv] lv ≘ y →
+ ∀y,I,K. K.ⓘ[I] ⨁{M}[gv] lv ≘ y →
∃∃v,d. K ⨁[gv] lv ≘ v & ⫯[0←d]v ≗ y.
#M #gv #lv #HM #y * [ #I | * #V ] #L #H
[ /2 width=2 by vpushs_inv_unit/