theorem instCoeContinuantFiatBoundaryImmaterialEntity._proof_1
theorem instCoeContinuantFiatBoundaryImmaterialEntity._proof_1: ∀ (v : ta3nj1a4.ContinuantFiatBoundary), ta3nj1a4.ImmaterialEntity.Is (Subtype.val v)
theorem instCoeContinuantFiatBoundaryImmaterialEntity._proof_1
theorem instCoeContinuantFiatBoundaryImmaterialEntity._proof_1: ∀ (v : ta3nj1a4.ContinuantFiatBoundary), ta3nj1a4.ImmaterialEntity.Is (Subtype.val v)