theorem instCoeDepTypeMammalOfIs._proof_1
theorem instCoeDepTypeMammalOfIs._proof_1: ∀ (x : Type) [tn9zvrjx.Mammal.Is x], tn9zvrjx.Mammal.Is x
theorem instCoeDepTypeMammalOfIs._proof_1
theorem instCoeDepTypeMammalOfIs._proof_1: ∀ (x : Type) [tn9zvrjx.Mammal.Is x], tn9zvrjx.Mammal.Is x