theorem BFO.instCoeFiatObjectPartMaterialEntity._proof_1
theorem BFO.instCoeFiatObjectPartMaterialEntity._proof_1: ∀ (v : hz46pbq2.BFO.FiatObjectPart), hz46pbq2.BFO.MaterialEntity.Is (Subtype.val v)
theorem BFO.instCoeFiatObjectPartMaterialEntity._proof_1
theorem BFO.instCoeFiatObjectPartMaterialEntity._proof_1: ∀ (v : hz46pbq2.BFO.FiatObjectPart), hz46pbq2.BFO.MaterialEntity.Is (Subtype.val v)