theorem BFO.instCoeObjectMaterialEntity._proof_1
theorem BFO.instCoeObjectMaterialEntity._proof_1: ∀ (v : hz46pbq2.BFO.Object), hz46pbq2.BFO.MaterialEntity.Is (Subtype.val v)
theorem BFO.instCoeObjectMaterialEntity._proof_1
theorem BFO.instCoeObjectMaterialEntity._proof_1: ∀ (v : hz46pbq2.BFO.Object), hz46pbq2.BFO.MaterialEntity.Is (Subtype.val v)