| liftsv_nil : liftsv f (◊) (◊)
| liftsv_cons: ∀T1s,T2s,T1,T2.
⬆*[f] T1 ≘ T2 → liftsv f T1s T2s →
- liftsv f (T1 @ T1s) (T2 @ T2s)
+ liftsv f (T1 ⨮ T1s) (T2 ⨮ T2s)
.
interpretation "uniform relocation (term vector)"
/2 width=5 by liftsv_inv_nil1_aux/ qed-.
fact liftsv_inv_cons1_aux: ∀f:rtmap. ∀X,Y. ⬆*[f] X ≘ Y →
- ∀T1,T1s. X = T1 @ T1s →
+ ∀T1,T1s. X = T1 ⨮ T1s →
∃∃T2,T2s. ⬆*[f] T1 ≘ T2 & ⬆*[f] T1s ≘ T2s &
- Y = T2 @ T2s.
+ Y = T2 ⨮ T2s.
#f #X #Y * -X -Y
[ #U1 #U1s #H destruct
| #T1s #T2s #T1 #T2 #HT12 #HT12s #U1 #U1s #H destruct /2 width=5 by ex3_2_intro/
qed-.
(* Basic_2A1: includes: liftv_inv_cons1 *)
-lemma liftsv_inv_cons1: ∀f:rtmap. ∀T1,T1s,Y. ⬆*[f] T1 @ T1s ≘ Y →
+lemma liftsv_inv_cons1: ∀f:rtmap. ∀T1,T1s,Y. ⬆*[f] T1 ⨮ T1s ≘ Y →
∃∃T2,T2s. ⬆*[f] T1 ≘ T2 & ⬆*[f] T1s ≘ T2s &
- Y = T2 @ T2s.
+ Y = T2 ⨮ T2s.
/2 width=3 by liftsv_inv_cons1_aux/ qed-.
fact liftsv_inv_nil2_aux: ∀f,X,Y. ⬆*[f] X ≘ Y → Y = ◊ → X = ◊.
/2 width=5 by liftsv_inv_nil2_aux/ qed-.
fact liftsv_inv_cons2_aux: ∀f:rtmap. ∀X,Y. ⬆*[f] X ≘ Y →
- ∀T2,T2s. Y = T2 @ T2s →
+ ∀T2,T2s. Y = T2 ⨮ T2s →
∃∃T1,T1s. ⬆*[f] T1 ≘ T2 & ⬆*[f] T1s ≘ T2s &
- X = T1 @ T1s.
+ X = T1 ⨮ T1s.
#f #X #Y * -X -Y
[ #U2 #U2s #H destruct
| #T1s #T2s #T1 #T2 #HT12 #HT12s #U2 #U2s #H destruct /2 width=5 by ex3_2_intro/
]
qed-.
-lemma liftsv_inv_cons2: ∀f:rtmap. ∀X,T2,T2s. ⬆*[f] X ≘ T2 @ T2s →
+lemma liftsv_inv_cons2: ∀f:rtmap. ∀X,T2,T2s. ⬆*[f] X ≘ T2 ⨮ T2s →
∃∃T1,T1s. ⬆*[f] T1 ≘ T2 & ⬆*[f] T1s ≘ T2s &
- X = T1 @ T1s.
+ X = T1 ⨮ T1s.
/2 width=3 by liftsv_inv_cons2_aux/ qed-.
(* Basic_1: was: lifts1_flat (left to right) *)