--- /dev/null
+(**************************************************************************)
+(* ___ *)
+(* ||M|| *)
+(* ||A|| A project by Andrea Asperti *)
+(* ||T|| *)
+(* ||I|| Developers: *)
+(* ||T|| The HELM team. *)
+(* ||A|| http://helm.cs.unibo.it *)
+(* \ / *)
+(* \ / This file is distributed under the terms of the *)
+(* v GNU General Public License Version 2 *)
+(* *)
+(**************************************************************************)
+
+include "basic_2/rt_transition/cpr_drops.ma".
+include "basic_2/rt_transition/cnr.ma".
+
+(* NORMAL TERMS FOR CONTEXT-SENSITIVE R-TRANSITION **************************)
+
+(* Advanced properties ******************************************************)
+
+(* Basic_1: was only: nf2_csort_lref *)
+lemma cnr_lref_atom (h) (b) (G) (L):
+ āi. ā¬*[b,šā“iāµ] L ā ā ā ā¦G,Lā¦ ā¢ ā”[h] šā¦#iā¦.
+#h #b #G #L #i #Hi #X #H
+elim (cpr_inv_lref1_drops ā¦ H) -H // * #K #V1 #V2 #HLK
+lapply (drops_gen b ā¦ HLK) -HLK #HLK
+lapply (drops_mono ā¦ Hi ā¦ HLK) -L #H destruct
+qed.
+
+(* Basic_1: was: nf2_lref_abst *)
+lemma cnr_lref_abst (h) (G) (L):
+ āK,V,i. ā¬*[i] L ā K.āV ā ā¦G,Lā¦ ā¢ ā”[h] šā¦#iā¦.
+#h #G #L #K #V #i #HLK #X #H
+elim (cpr_inv_lref1_drops ā¦ H) -H // *
+#K0 #V1 #V2 #HLK0 #_ #_
+lapply (drops_mono ā¦ HLK ā¦ HLK0) -L #H destruct
+qed.
+
+lemma cnr_lref_unit (h) (I) (G) (L):
+ āK,i. ā¬*[i] L ā K.ā¤{I} ā ā¦G,Lā¦ ā¢ ā”[h] šā¦#iā¦.
+#h #I #G #L #K #i #HLK #X #H
+elim (cpr_inv_lref1_drops ā¦ H) -H // *
+#K0 #V1 #V2 #HLK0 #_ #_
+lapply (drops_mono ā¦ HLK ā¦ HLK0) -L #H destruct
+qed.
+
+(* Properties with generic relocation ***************************************)
+
+(* Basic_1: was: nf2_lift *)
+(* Basic_2A1: uses: cnr_lift *)
+lemma cnr_lifts (h) (G): d_liftable1 ā¦ (cnr h G).
+#h #G #K #T #HT #b #f #L #HLK #U #HTU #U0 #H
+elim (cpm_inv_lifts_sn ā¦ H ā¦ HLK ā¦ HTU) -b -L #T0 #HTU0 #HT0
+lapply (HT ā¦ HT0) -G -K #H destruct /2 width=4 by lifts_mono/
+qed-.
+
+(* Advanced inversion lemmas ************************************************)
+
+(* Basic_2A1: was: cnr_inv_delta *)
+lemma cnr_inv_lref_abbr (h) (G) (L):
+ āK,V,i. ā¬*[i] L ā K.āV ā ā¦G,Lā¦ ā¢ ā”[h] šā¦#iā¦ ā ā„.
+#h #G #L #K #V #i #HLK #H
+elim (lifts_total V šā“āiāµ) #W #HVW
+lapply (H W ?) -H [ /3 width=6 by cpm_delta_drops/ ] -HLK #H destruct
+elim (lifts_inv_lref2_uni_lt ā¦ HVW) -HVW //
+qed-.
+
+(* Inversion lemmas with generic relocation *********************************)
+
+(* Note: this was missing in Basic_1 *)
+(* Basic_2A1: uses: cnr_inv_lift *)
+lemma cnr_inv_lifts (h) (G): d_deliftable1 ā¦ (cnr h G).
+#h #G #L #U #HU #b #f #K #HLK #T #HTU #T0 #H
+elim (cpm_lifts_sn ā¦ H ā¦ HLK ā¦ HTU) -b -K #U0 #HTU0 #HU0
+lapply (HU ā¦ HU0) -G -L #H destruct /2 width=4 by lifts_inj/
+qed-.