case trans e _ hi => exact e.progress_ssubset |>.trans hi
α : Type
inst✝ : Hierarchical α
s₁ s₂ : State α
rcn : ID
s₁✝ s₂✝ s₃✝ : State α
e : s₁✝ ↓ᵢ s₂✝
a✝ : s₂✝ ↓ᵢ+ s₃✝
hi : s₂✝.progress ⊂ s₃✝.progress
⊢ s₁✝.progress ⊂ s₃✝.progress
no goals