theorem BFO.MaterialEntityOrSite.materialEntity.inj
theorem BFO.MaterialEntityOrSite.materialEntity.inj: ∀ {a a_1 : j12bzjgj.BFO.MaterialEntity}, j12bzjgj.BFO.MaterialEntityOrSite.materialEntity a = j12bzjgj.BFO.MaterialEntityOrSite.materialEntity a_1 → a = a_1