theorem instCoeContinuantFiatBoundaryImmaterialEntity._proof_1
theorem instCoeContinuantFiatBoundaryImmaterialEntity._proof_1: ∀ (v : d4qbfhxh.ContinuantFiatBoundary), d4qbfhxh.ImmaterialEntity.Is (Subtype.val v)
theorem instCoeContinuantFiatBoundaryImmaterialEntity._proof_1
theorem instCoeContinuantFiatBoundaryImmaterialEntity._proof_1: ∀ (v : d4qbfhxh.ContinuantFiatBoundary), d4qbfhxh.ImmaterialEntity.Is (Subtype.val v)