(* Main properties **********************************************************)
-(* Basic_2A1: uses: lleq_bind lleq_bind_O *)
+(* Basic_2A1: uses: lleq_bind lleq_bind_O *)
theorem reqx_bind: ∀p,I,L1,L2,V1,V2,T.
L1 ≛[V1] L2 → L1.ⓑ{I}V1 ≛[T] L2.ⓑ{I}V2 →
L1 ≛[ⓑ{p,I}V1.T] L2.
(* Negated properties *******************************************************)
-(* Note: auto works with /4 width=8/ so reqx_canc_sn is preferred **********)
+(* Note: auto works with /4 width=8/ so reqx_canc_sn is preferred **********)
(* Basic_2A1: uses: lleq_nlleq_trans *)
lemma reqx_rneqx_trans: ∀T:term.∀L1,L. L1 ≛[T] L →
∀L2. (L ≛[T] L2 → ⊥) → (L1 ≛[T] L2 → ⊥).