theorem instCoeDaughterPerson._proof_1
theorem instCoeDaughterPerson._proof_1: ∀ (v : qxpdv9xr.Daughter), qxpdv9xr.Person.Is (Subtype.val v)
theorem instCoeDaughterPerson._proof_1
theorem instCoeDaughterPerson._proof_1: ∀ (v : qxpdv9xr.Daughter), qxpdv9xr.Person.Is (Subtype.val v)