(* Basic properties *********************************************************)
+lemma rfw_unfold (L) (T): ♯❨L❩ + ♯❨T❩ = ♯❨L,T❩.
+// qed.
+
(* Basic_1: was: flt_shift *)
lemma rfw_shift: ∀p,I,K,V,T. ♯❨K.ⓑ[I]V,T❩ < ♯❨K,ⓑ[p,I]V.T❩.
-normalize /2 width=1 by nle_plus_bi_sn/
-qed.
+/2 width=1 by plt_plus_bi_sn/ qed.
lemma rfw_clear: ∀p,I1,I2,K,V,T. ♯❨K.ⓤ[I1],T❩ < ♯❨K,ⓑ[p,I2]V.T❩.
-normalize /4 width=1 by nle_plus_bi_sn, nle_succ_bi/
-qed.
+/2 width=1 by plt_plus_bi_sn/ qed.
lemma rfw_tpair_sn: ∀I,L,V,T. ♯❨L,V❩ < ♯❨L,②[I]V.T❩.
-normalize in ⊢ (?→?→?→?→?%%); //
-qed.
+/2 width=1 by plt_plus_bi_sn/ qed.
lemma rfw_tpair_dx: ∀I,L,V,T. ♯❨L,T❩ < ♯❨L,②[I]V.T❩.
-normalize in ⊢ (?→?→?→?→?%%); //
-qed.
+/2 width=1 by plt_plus_bi_sn/ qed.
lemma rfw_lpair_sn: ∀I,L,V,T. ♯❨L,V❩ < ♯❨L.ⓑ[I]V,T❩.
-normalize /3 width=1 by nlt_plus_bi_dx, nle_plus_bi_sn/
-qed.
+// qed.
lemma rfw_lpair_dx: ∀I,L,V,T. ♯❨L,T❩ < ♯❨L.ⓑ[I]V,T❩.
-normalize /3 width=1 by nlt_plus_bi_dx, nle_plus_bi_sn/
-qed.
+/2 width=1 by plt_plus_bi_dx/ qed.
(* Basic_1: removed theorems 7:
flt_thead_sx flt_thead_dx flt_trans