theorem instCoeMammalObject._proof_1
theorem instCoeMammalObject._proof_1: ∀ (v : jh3kw4vp.Mammal), d4qbfhxh.Object.Is (Subtype.val v)
theorem instCoeMammalObject._proof_1
theorem instCoeMammalObject._proof_1: ∀ (v : jh3kw4vp.Mammal), d4qbfhxh.Object.Is (Subtype.val v)