theorem instCoeMammalObject._proof_1
theorem instCoeMammalObject._proof_1: ∀ (v : ay9krd84.Mammal), qszr71sj.Object.Is (Subtype.val v)
theorem instCoeMammalObject._proof_1
theorem instCoeMammalObject._proof_1: ∀ (v : ay9krd84.Mammal), qszr71sj.Object.Is (Subtype.val v)