'SnAbst L T = (append (LPair LAtom Abst T) L).
definition d_appendable_sn: predicate (lenv→relation term) ≝ λR.
- ∀K,T1,T2. R K T1 T2 → ∀L. R (L ;; K) T1 T2.
+ ∀K,T1,T2. R K T1 T2 → ∀L. R (L ● K) T1 T2.
(* Basic properties *********************************************************)
-lemma append_atom_sn: ∀L. ⋆ ;; L = L.
+lemma append_atom_sn: ∀L. ⋆ ● L = L.
#L elim L -L normalize //
qed.
#L1 #L2 #L3 elim L3 -L3 normalize //
qed.
-lemma append_length: ∀L1,L2. |L1 ;; L2| = |L1| + |L2|.
+lemma append_length: ∀L1,L2. |L1 ● L2| = |L1| + |L2|.
#L1 #L2 elim L2 -L2 normalize //
qed.
(* Basic inversion lemmas ***************************************************)
-lemma append_inj_sn: ∀K1,K2,L1,L2. L1 ;; K1 = L2 ;; K2 → |K1| = |K2| →
+lemma append_inj_sn: ∀K1,K2,L1,L2. L1 ● K1 = L2 ● K2 → |K1| = |K2| →
L1 = L2 ∧ K1 = K2.
#K1 elim K1 -K1
[ * normalize /2 width=1 by conj/
qed-.
(* Note: lemma 750 *)
-lemma append_inj_dx: ∀K1,K2,L1,L2. L1 ;; K1 = L2 ;; K2 → |L1| = |L2| →
+lemma append_inj_dx: ∀K1,K2,L1,L2. L1 ● K1 = L2 ● K2 → |L1| = |L2| →
L1 = L2 ∧ K1 = K2.
#K1 elim K1 -K1
[ * normalize /2 width=1 by conj/
]
qed-.
-lemma append_inv_refl_dx: ∀L,K. L ;; K = L → K = ⋆.
+lemma append_inv_refl_dx: ∀L,K. L ● K = L → K = ⋆.
#L #K #H elim (append_inj_dx … (⋆) … H) //
qed-.
-lemma append_inv_pair_dx: ∀I,L,K,V. L ;; K = L.ⓑ{I}V → K = ⋆.ⓑ{I}V.
+lemma append_inv_pair_dx: ∀I,L,K,V. L ● K = L.ⓑ{I}V → K = ⋆.ⓑ{I}V.
#I #L #K #V #H elim (append_inj_dx … (⋆.ⓑ{I}V) … H) //
qed-.