-lemma cpx_req_conf_sn: ∀h,G. s_r_confluent1 … (cpx h G) req.
-/2 width=5 by cpx_rex_conf/ qed-.
-(*
-(* Basic_2A1: was: cpx_lleq_conf_dx *)
-lemma cpx_req_conf_dx: ∀h,G,L2,T1,T2. ⦃G,L2⦄ ⊢ T1 ⬈[h] T2 →
- ∀L1. L1 ≘[T1] L2 → L1 ≘[T2] L2.
-/4 width=6 by cpx_req_conf_sn, req_sym/ qed-.
-*)