(* Basic_2A1: includes: liftv_nil liftv_cons *)
inductive liftsv (f:rtmap): relation (list term) ≝
-| liftsv_nil : liftsv f (â\97\8a) (â\97\8a)
+| liftsv_nil : liftsv f (â\92º) (â\92º)
| liftsv_cons: ∀T1s,T2s,T1,T2.
⬆*[f] T1 ≘ T2 → liftsv f T1s T2s →
liftsv f (T1 ⨮ T1s) (T2 ⨮ T2s)
(* Basic inversion lemmas ***************************************************)
-fact liftsv_inv_nil1_aux: â\88\80f,X,Y. â¬\86*[f] X â\89\98 Y â\86\92 X = â\97\8a â\86\92 Y = â\97\8a.
+fact liftsv_inv_nil1_aux: â\88\80f,X,Y. â¬\86*[f] X â\89\98 Y â\86\92 X = â\92º â\86\92 Y = â\92º.
#f #X #Y * -X -Y //
#T1s #T2s #T1 #T2 #_ #_ #H destruct
qed-.
(* Basic_2A1: includes: liftv_inv_nil1 *)
-lemma liftsv_inv_nil1: â\88\80f,Y. â¬\86*[f] â\97\8a â\89\98 Y â\86\92 Y = â\97\8a.
+lemma liftsv_inv_nil1: â\88\80f,Y. â¬\86*[f] â\92º â\89\98 Y â\86\92 Y = â\92º.
/2 width=5 by liftsv_inv_nil1_aux/ qed-.
fact liftsv_inv_cons1_aux: ∀f:rtmap. ∀X,Y. ⬆*[f] X ≘ Y →
Y = T2 ⨮ T2s.
/2 width=3 by liftsv_inv_cons1_aux/ qed-.
-fact liftsv_inv_nil2_aux: â\88\80f,X,Y. â¬\86*[f] X â\89\98 Y â\86\92 Y = â\97\8a â\86\92 X = â\97\8a.
+fact liftsv_inv_nil2_aux: â\88\80f,X,Y. â¬\86*[f] X â\89\98 Y â\86\92 Y = â\92º â\86\92 X = â\92º.
#f #X #Y * -X -Y //
#T1s #T2s #T1 #T2 #_ #_ #H destruct
qed-.
-lemma liftsv_inv_nil2: â\88\80f,X. â¬\86*[f] X â\89\98 â\97\8a â\86\92 X = â\97\8a.
+lemma liftsv_inv_nil2: â\88\80f,X. â¬\86*[f] X â\89\98 â\92º â\86\92 X = â\92º.
/2 width=5 by liftsv_inv_nil2_aux/ qed-.
fact liftsv_inv_cons2_aux: ∀f:rtmap. ∀X,Y. ⬆*[f] X ≘ Y →