theorem BFO.instCoeObjectAggregateMaterialEntity._proof_1
theorem BFO.instCoeObjectAggregateMaterialEntity._proof_1: ∀ (v : j12bzjgj.BFO.ObjectAggregate), j12bzjgj.BFO.MaterialEntity.Is (Subtype.val v)
theorem BFO.instCoeObjectAggregateMaterialEntity._proof_1
theorem BFO.instCoeObjectAggregateMaterialEntity._proof_1: ∀ (v : j12bzjgj.BFO.ObjectAggregate), j12bzjgj.BFO.MaterialEntity.Is (Subtype.val v)