exact hi (e₁.deterministic e₂ ▸ e₂') (e₁.preserves_nontrivial n) ht hp
α : Type
inst✝ : Proper α
s s₁ s₂ s₁✝ s₂✝¹ s₃✝ : State α
e₁ : Step s₁✝ s₂✝¹
a✝ : Steps s₂✝¹ s₃✝
hi : Steps s₂✝¹ s₂ → State.Nontrivial s₂✝¹ → s₃✝.tag = s₂.tag → s₃✝.progress = s₂.progress → s₃✝ = s₂
n : State.Nontrivial s₁✝
ht : s₃✝.tag = s₂.tag
hp : s₃✝.progress = s₂.progress
s₂✝ : State α
e₂ : Step s₁✝ s₂✝
e₂' : Steps s₂✝ s₂
⊢ s₃✝ = s₂
no goals