theorem instCoeFiatSurfaceContinuantFiatBoundary._proof_1
theorem instCoeFiatSurfaceContinuantFiatBoundary._proof_1: ∀ (v : d4qbfhxh.FiatSurface), d4qbfhxh.ContinuantFiatBoundary.Is (Subtype.val v)
theorem instCoeFiatSurfaceContinuantFiatBoundary._proof_1
theorem instCoeFiatSurfaceContinuantFiatBoundary._proof_1: ∀ (v : d4qbfhxh.FiatSurface), d4qbfhxh.ContinuantFiatBoundary.Is (Subtype.val v)