∀ {α : Sort u_1} {r : α → α → Prop} {a : α} {motive : (a_1 : α) → Relation.ReflGen r a a_1 → Prop} {a_1 : α}
  (t : Relation.ReflGen r a a_1), motive a ⋯ → (∀ {b : α} (a_2 : r a b), motive b ⋯) → motive a_1 t