theorem instCoeDaughterPerson._proof_1
theorem instCoeDaughterPerson._proof_1: ∀ (v : yvbc459t.Daughter), yvbc459t.Person.Is (Subtype.val v)
theorem instCoeDaughterPerson._proof_1
theorem instCoeDaughterPerson._proof_1: ∀ (v : yvbc459t.Daughter), yvbc459t.Person.Is (Subtype.val v)