no goals
α : Type ?u.343526
β : Type ?u.343529
γ : Type ?u.343532
r : α → α → Prop
s : β → β → Prop
t : γ → γ → Prop
o : Ordinal
ho : ∀ (a : Ordinal), a < o → succ a < o
⊢ ∀ (a : Ordinal), a < o → succ a < o
assumption