theorem instCoeDepTypeRoleOfIs._proof_1
theorem instCoeDepTypeRoleOfIs._proof_1: ∀ (x : Type) [d4qbfhxh.Role.Is x], d4qbfhxh.Role.Is x
theorem instCoeDepTypeRoleOfIs._proof_1
theorem instCoeDepTypeRoleOfIs._proof_1: ∀ (x : Type) [d4qbfhxh.Role.Is x], d4qbfhxh.Role.Is x