theorem instCoeDepTypeMammalOfIs._proof_1
theorem instCoeDepTypeMammalOfIs._proof_1: ∀ (x : Type) [ay9krd84.Mammal.Is x], ay9krd84.Mammal.Is x
theorem instCoeDepTypeMammalOfIs._proof_1
theorem instCoeDepTypeMammalOfIs._proof_1: ∀ (x : Type) [ay9krd84.Mammal.Is x], ay9krd84.Mammal.Is x