(* GENERIC SLICING FOR LOCAL ENVIRONMENTS ***********************************)
+(* Main properties on generic relocation ************************************)
+
+lemma d_liftable2_sn_bi: ∀R. d_liftable2_sn R → d_liftable2_bi R.
+#R #HR #K #T1 #T2 #HT12 #b #f #L #HLK #U1 #HTU1 #U2 #HTU2
+elim (HR … HT12 … HLK … HTU1) -HR -K -T1 #X #HTX #HUX
+<(lifts_mono … HTX … HTU2) -T2 -U2 -b -f //
+qed-.
+
+lemma d_deliftable2_sn_bi: ∀R. d_deliftable2_sn R → d_deliftable2_bi R.
+#R #HR #L #U1 #U2 #HU12 #b #f #K #HLK #T1 #HTU1 #T2 #HTU2
+elim (HR … HU12 … HLK … HTU1) -HR -L -U1 #X #HUX #HTX
+<(lifts_inj … HUX … HTU2) -U2 -T2 -b -f //
+qed-.
+
(* Main properties **********************************************************)
(* Basic_2A1: includes: drop_conf_ge drop_conf_be drop_conf_le *)
(* Basic_2A1: includes: drop_mono *)
lemma drops_mono: ∀b1,f,L,L1. ⬇*[b1, f] L ≡ L1 →
∀b2,L2. ⬇*[b2, f] L ≡ L2 → L1 = L2.
-#b1 #f #L #L1 lapply (isid_after_dx 𝐈𝐝 … f)
+#b1 #f #L #L1 lapply (after_isid_dx 𝐈𝐝 … f)
/3 width=8 by drops_conf, drops_fwd_isid/
qed-.
lapply (drops_mono … H0 … Hf2) -L #H
destruct /2 width=1 by and3_intro/
qed-.
+
+lemma drops_inv_uni: ∀L,i. ⬇*[Ⓕ, 𝐔❴i❵] L ≡ ⋆ → ∀I,K,V. ⬇*[i] L ≡ K.ⓑ{I}V → ⊥.
+#L #i #H1 #I #K #V #H2
+lapply (drops_F … H2) -H2 #H2
+lapply (drops_mono … H2 … H1) -L -i #H destruct
+qed-.