+lemma lex_refl (R): c_reflexive … R → reflexive … (lex R).
+/4 width=3 by sex_refl, ext2_refl, ex2_intro/ qed.
+
+lemma lex_co (R1) (R2): (∀L,T1,T2. R1 L T1 T2 → R2 L T1 T2) →
+ ∀L1,L2. L1 ⪤[R1] L2 → L1 ⪤[R2] L2.
+#R1 #R2 #HR #L1 #L2 * /5 width=7 by sex_co, cext2_co, ex2_intro/
+qed-.
+
+(* Advanced properties ******************************************************)
+
+lemma lex_bind_refl_dx (R): c_reflexive … R →
+ ∀I,K1,K2. K1 ⪤[R] K2 → K1.ⓘ{I} ⪤[R] K2.ⓘ{I}.
+/3 width=3 by ext2_refl, lex_bind/ qed.
+
+lemma lex_unit (R): ∀I,K1,K2. K1 ⪤[R] K2 → K1.ⓤ{I} ⪤[R] K2.ⓤ{I}.
+/3 width=1 by lex_bind, ext2_unit/ qed.
+
+(* Basic_2A1: was: lpx_sn_pair *)
+lemma lex_pair (R): ∀I,K1,K2,V1,V2. K1 ⪤[R] K2 → R K1 V1 V2 →
+ K1.ⓑ{I}V1 ⪤[R] K2.ⓑ{I}V2.
+/3 width=1 by lex_bind, ext2_pair/ qed.
+
+(* Basic inversion lemmas ***************************************************)
+
+(* Basic_2A1: was: lpx_sn_inv_atom1: *)
+lemma lex_inv_atom_sn (R): ∀L2. ⋆ ⪤[R] L2 → L2 = ⋆.
+#R #L2 * #f #Hf #H >(sex_inv_atom1 … H) -L2 //
+qed-.
+
+lemma lex_inv_bind_sn (R): ∀I1,L2,K1. K1.ⓘ{I1} ⪤[R] L2 →
+ ∃∃I2,K2. K1 ⪤[R] K2 & cext2 R K1 I1 I2 & L2 = K2.ⓘ{I2}.
+#R #I1 #L2 #K1 * #f #Hf #H
+lapply (sex_eq_repl_fwd … H (⫯f) ?) -H /2 width=1 by eq_push_inv_isid/ #H
+elim (sex_inv_push1 … H) -H #I2 #K2 #HK12 #HI12 #H destruct
+/3 width=5 by ex2_intro, ex3_2_intro/
+qed-.
+
+(* Basic_2A1: was: lpx_sn_inv_atom2 *)
+lemma lex_inv_atom_dx (R): ∀L1. L1 ⪤[R] ⋆ → L1 = ⋆.
+#R #L1 * #f #Hf #H >(sex_inv_atom2 … H) -L1 //
+qed-.
+
+lemma lex_inv_bind_dx (R): ∀I2,L1,K2. L1 ⪤[R] K2.ⓘ{I2} →
+ ∃∃I1,K1. K1 ⪤[R] K2 & cext2 R K1 I1 I2 & L1 = K1.ⓘ{I1}.
+#R #I2 #L1 #K2 * #f #Hf #H
+lapply (sex_eq_repl_fwd … H (⫯f) ?) -H /2 width=1 by eq_push_inv_isid/ #H
+elim (sex_inv_push2 … H) -H #I1 #K1 #HK12 #HI12 #H destruct
+/3 width=5 by ex3_2_intro, ex2_intro/
+qed-.
+
+(* Advanced inversion lemmas ************************************************)
+
+lemma lex_inv_unit_sn (R): ∀I,L2,K1. K1.ⓤ{I} ⪤[R] L2 →
+ ∃∃K2. K1 ⪤[R] K2 & L2 = K2.ⓤ{I}.
+#R #I #L2 #K1 #H
+elim (lex_inv_bind_sn … H) -H #Z2 #K2 #HK12 #HZ2 #H destruct
+elim (ext2_inv_unit_sn … HZ2) -HZ2
+/2 width=3 by ex2_intro/
+qed-.
+
+(* Basic_2A1: was: lpx_sn_inv_pair1 *)
+lemma lex_inv_pair_sn (R): ∀I,L2,K1,V1. K1.ⓑ{I}V1 ⪤[R] L2 →
+ ∃∃K2,V2. K1 ⪤[R] K2 & R K1 V1 V2 & L2 = K2.ⓑ{I}V2.
+#R #I #L2 #K1 #V1 #H
+elim (lex_inv_bind_sn … H) -H #Z2 #K2 #HK12 #HZ2 #H destruct
+elim (ext2_inv_pair_sn … HZ2) -HZ2 #V2 #HV12 #H destruct
+/2 width=5 by ex3_2_intro/
+qed-.
+
+lemma lex_inv_unit_dx (R): ∀I,L1,K2. L1 ⪤[R] K2.ⓤ{I} →
+ ∃∃K1. K1 ⪤[R] K2 & L1 = K1.ⓤ{I}.
+#R #I #L1 #K2 #H
+elim (lex_inv_bind_dx … H) -H #Z1 #K1 #HK12 #HZ1 #H destruct
+elim (ext2_inv_unit_dx … HZ1) -HZ1
+/2 width=3 by ex2_intro/
+qed-.
+
+(* Basic_2A1: was: lpx_sn_inv_pair2 *)
+lemma lex_inv_pair_dx (R): ∀I,L1,K2,V2. L1 ⪤[R] K2.ⓑ{I}V2 →
+ ∃∃K1,V1. K1 ⪤[R] K2 & R K1 V1 V2 & L1 = K1.ⓑ{I}V1.
+#R #I #L1 #K2 #V2 #H
+elim (lex_inv_bind_dx … H) -H #Z1 #K1 #HK12 #HZ1 #H destruct
+elim (ext2_inv_pair_dx … HZ1) -HZ1 #V1 #HV12 #H destruct
+/2 width=5 by ex3_2_intro/
+qed-.
+
+(* Basic_2A1: was: lpx_sn_inv_pair *)
+lemma lex_inv_pair (R): ∀I1,I2,L1,L2,V1,V2.
+ L1.ⓑ{I1}V1 ⪤[R] L2.ⓑ{I2}V2 →
+ ∧∧ L1 ⪤[R] L2 & R L1 V1 V2 & I1 = I2.
+#R #I1 #I2 #L1 #L2 #V1 #V2 #H elim (lex_inv_pair_sn … H) -H
+#L0 #V0 #HL10 #HV10 #H destruct /2 width=1 by and3_intro/
+qed-.
+
+(* Basic eliminators ********************************************************)
+
+lemma lex_ind (R) (Q:relation2 …):
+ Q (⋆) (⋆) →
+ (
+ ∀I,K1,K2. K1 ⪤[R] K2 → Q K1 K2 → Q (K1.ⓤ{I}) (K2.ⓤ{I})
+ ) → (
+ ∀I,K1,K2,V1,V2. K1 ⪤[R] K2 → Q K1 K2 → R K1 V1 V2 →Q (K1.ⓑ{I}V1) (K2.ⓑ{I}V2)
+ ) →
+ ∀L1,L2. L1 ⪤[R] L2 → Q L1 L2.
+#R #Q #IH1 #IH2 #IH3 #L1 #L2 * #f @pull_2 #H
+elim H -f -L1 -L2 // #f #I1 #I2 #K1 #K2 @pull_4 #H
+[ elim (isid_inv_next … H)
+| lapply (isid_inv_push … H ??)
+] -H [5:|*: // ] #Hf @pull_2 #H
+elim H -H /3 width=3 by ex2_intro/
+qed-.