simp [Dependency.Acyclic.iff_mem_acyclic]
α : Type
inst✝ : Hierarchical α
rtr : α
p : Progress rtr
⊢ Dependency.Acyclic rtr
α : Type
inst✝ : Hierarchical α
rtr : α
p : Progress rtr
⊢ ∀ i ∈ rtr[Component.rcn], ¬i <[rtr] i