theorem instCoeContinuantFiatBoundaryImmaterialEntity._proof_1
theorem instCoeContinuantFiatBoundaryImmaterialEntity._proof_1: ∀ (v : qszr71sj.ContinuantFiatBoundary), qszr71sj.ImmaterialEntity.Is (Subtype.val v)
theorem instCoeContinuantFiatBoundaryImmaterialEntity._proof_1
theorem instCoeContinuantFiatBoundaryImmaterialEntity._proof_1: ∀ (v : qszr71sj.ContinuantFiatBoundary), qszr71sj.ImmaterialEntity.Is (Subtype.val v)