theorem instCoeDepTypeFiatSurfaceOfIs._proof_1
theorem instCoeDepTypeFiatSurfaceOfIs._proof_1: ∀ (x : Type) [d4qbfhxh.FiatSurface.Is x], d4qbfhxh.FiatSurface.Is x
theorem instCoeDepTypeFiatSurfaceOfIs._proof_1
theorem instCoeDepTypeFiatSurfaceOfIs._proof_1: ∀ (x : Type) [d4qbfhxh.FiatSurface.Is x], d4qbfhxh.FiatSurface.Is x