(* Basic_2A1: was: lleq *)
definition req: relation3 term lenv lenv ≝
- rex ceq.
+ rex ceq.
interpretation
- "syntactic equivalence on referred entries (local environment)"
- 'IdEqSn T L1 L2 = (req T L1 L2).
+ "syntactic equivalence on referred entries (local environment)"
+ 'IdEqSn T L1 L2 = (req T L1 L2).
-(* Note: "req_transitive R" is equivalent to "rex_transitive ceq R R" *)
+(* Note: "R_transitive_req R" is equivalent to "R_transitive_rex ceq R R" *)
(* Basic_2A1: uses: lleq_transitive *)
-definition req_transitive: predicate (relation3 lenv term term) ≝
+definition R_transitive_req: predicate (relation3 lenv term term) ≝
λR. ∀L2,T1,T2. R L2 T1 T2 → ∀L1. L1 ≡[T1] L2 → R L1 T1 T2.
(* Basic inversion lemmas ***************************************************)
-lemma req_inv_bind: ∀p,I,L1,L2,V,T. L1 ≡[ⓑ[p,I]V.T] L2 →
- ∧∧ L1 ≡[V] L2 & L1.ⓑ[I]V ≡[T] L2.ⓑ[I]V.
+lemma req_inv_bind:
+ ∀p,I,L1,L2,V,T. L1 ≡[ⓑ[p,I]V.T] L2 →
+ ∧∧ L1 ≡[V] L2 & L1.ⓑ[I]V ≡[T] L2.ⓑ[I]V.
/2 width=2 by rex_inv_bind/ qed-.
-lemma req_inv_flat: ∀I,L1,L2,V,T. L1 ≡[ⓕ[I]V.T] L2 →
- ∧∧ L1 ≡[V] L2 & L1 ≡[T] L2.
+lemma req_inv_flat:
+ ∀I,L1,L2,V,T. L1 ≡[ⓕ[I]V.T] L2 →
+ ∧∧ L1 ≡[V] L2 & L1 ≡[T] L2.
/2 width=2 by rex_inv_flat/ qed-.
(* Advanced inversion lemmas ************************************************)
-lemma req_inv_zero_pair_sn: ∀I,L2,K1,V. K1.ⓑ[I]V ≡[#0] L2 →
- ∃∃K2. K1 ≡[V] K2 & L2 = K2.ⓑ[I]V.
+lemma req_inv_zero_pair_sn:
+ ∀I,L2,K1,V. K1.ⓑ[I]V ≡[#0] L2 →
+ ∃∃K2. K1 ≡[V] K2 & L2 = K2.ⓑ[I]V.
#I #L2 #K1 #V #H
elim (rex_inv_zero_pair_sn … H) -H #K2 #X #HK12 #HX #H destruct
/2 width=3 by ex2_intro/
qed-.
-lemma req_inv_zero_pair_dx: ∀I,L1,K2,V. L1 ≡[#0] K2.ⓑ[I]V →
- ∃∃K1. K1 ≡[V] K2 & L1 = K1.ⓑ[I]V.
+lemma req_inv_zero_pair_dx:
+ ∀I,L1,K2,V. L1 ≡[#0] K2.ⓑ[I]V →
+ ∃∃K1. K1 ≡[V] K2 & L1 = K1.ⓑ[I]V.
#I #L1 #K2 #V #H
elim (rex_inv_zero_pair_dx … H) -H #K1 #X #HK12 #HX #H destruct
/2 width=3 by ex2_intro/
qed-.
-lemma req_inv_lref_bind_sn: ∀I1,K1,L2,i. K1.ⓘ[I1] ≡[#↑i] L2 →
- ∃∃I2,K2. K1 ≡[#i] K2 & L2 = K2.ⓘ[I2].
+lemma req_inv_lref_bind_sn:
+ ∀I1,K1,L2,i. K1.ⓘ[I1] ≡[#↑i] L2 →
+ ∃∃I2,K2. K1 ≡[#i] K2 & L2 = K2.ⓘ[I2].
/2 width=2 by rex_inv_lref_bind_sn/ qed-.
-lemma req_inv_lref_bind_dx: ∀I2,K2,L1,i. L1 ≡[#↑i] K2.ⓘ[I2] →
- ∃∃I1,K1. K1 ≡[#i] K2 & L1 = K1.ⓘ[I1].
+lemma req_inv_lref_bind_dx:
+ ∀I2,K2,L1,i. L1 ≡[#↑i] K2.ⓘ[I2] →
+ ∃∃I1,K1. K1 ≡[#i] K2 & L1 = K1.ⓘ[I1].
/2 width=2 by rex_inv_lref_bind_dx/ qed-.
(* Basic forward lemmas *****************************************************)
(* Basic_2A1: was: llpx_sn_lrefl *)
(* Basic_2A1: this should have been lleq_fwd_llpx_sn *)
-lemma req_fwd_rex: ∀R. c_reflexive … R →
- ∀L1,L2,T. L1 ≡[T] L2 → L1 ⪤[R,T] L2.
+lemma req_fwd_rex (R):
+ c_reflexive … R →
+ ∀L1,L2,T. L1 ≡[T] L2 → L1 ⪤[R,T] L2.
#R #HR #L1 #L2 #T * #f #Hf #HL12
/4 width=7 by sex_co, cext2_co, ex2_intro/
qed-.
(* Basic_properties *********************************************************)
-lemma frees_req_conf: ∀f,L1,T. L1 ⊢ 𝐅+❪T❫ ≘ f →
- ∀L2. L1 ≡[T] L2 → L2 ⊢ 𝐅+❪T❫ ≘ f.
+lemma frees_req_conf:
+ ∀f,L1,T. L1 ⊢ 𝐅+❪T❫ ≘ f →
+ ∀L2. L1 ≡[T] L2 → L2 ⊢ 𝐅+❪T❫ ≘ f.
#f #L1 #T #H elim H -f -L1 -T
[ /2 width=3 by frees_sort/
| #f #i #Hf #L2 #H2