(* Main properties properties ***********************************************)
-lemma tpr_tif_eq: ∀T1,T2. T1 ➡ T2 → 𝐈[T1] → T1 = T2.
+lemma tpr_tif_eq: ∀T1,T2. T1 ➡ T2 → 𝐈⦃T1⦄ → T1 = T2.
#T1 #T2 #H elim H -T1 -T2
[ //
| * #V1 #V2 #T1 #T2 #_ #_ #IHV1 #IHT1 #H
]
qed.
-theorem tif_tnf: ∀T1. 𝐈[T1] → 𝐍[T1].
-/2 width=1/ qed.
+theorem tif_tnf: ∀T1. 𝐈⦃T1⦄ → 𝐍⦃T1⦄.
+/3 width=1/ qed.
(* Note: this property is unusual *)
-lemma tnf_trf_false: ∀T1. 𝐑[T1] → 𝐍[T1] → False.
+lemma tnf_trf_false: ∀T1. 𝐑⦃T1⦄ → 𝐍⦃T1⦄ → ⊥.
#T1 #H elim H -T1
[ #V #T #_ #IHV #H elim (tnf_inv_abst … H) -H /2 width=1/
| #V #T #_ #IHT #H elim (tnf_inv_abst … H) -H /2 width=1/
]
qed.
-theorem tnf_tif: ∀T1. 𝐍[T1] → 𝐈[T1].
+theorem tnf_tif: ∀T1. 𝐍⦃T1⦄ → 𝐈⦃T1⦄.
/2 width=3/ qed.
-lemma tnf_abst: ∀V,T. 𝐍[V] → 𝐍[T] → 𝐍[ⓛV.T].
+lemma tnf_abst: ∀V,T. 𝐍⦃V⦄ → 𝐍⦃T⦄ → 𝐍⦃ⓛV.T⦄.
/4 width=1/ qed.
-lemma tnf_appl: ∀V,T. 𝐍[V] → 𝐍[T] → 𝐒[T] → 𝐍[ⓐV.T].
+lemma tnf_appl: ∀V,T. 𝐍⦃V⦄ → 𝐍⦃T⦄ → 𝐒⦃T⦄ → 𝐍⦃ⓐV.T⦄.
/4 width=1/ qed.