material entity material entity material (forall (x) (if (MaterialEntity x) (IndependentContinuant x))) // axiom label in BFO2 CLIF: [019-002] (forall (x) (if (and (Entity x) (exists (y t) (and (MaterialEntity y) (continuantPartOfAt y x t)))) (MaterialEntity x))) // axiom label in BFO2 CLIF: [020-002] (forall (x) (if (and (Entity x) (exists (y t) (and (MaterialEntity y) (continuantPartOfAt x y t)))) (MaterialEntity x))) // axiom label in BFO2 CLIF: [021-002] A material entity is an independent continuant that has some portion of matter as proper or improper continuant part. (axiom label in BFO2 Reference: [019-002]) MaterialEntity An independent continuant that is spatially extended whose identity is independent of that of other entities and can be maintained through time. Every entity which has a material entity as continuant part is a material entity. (axiom label in BFO2 Reference: [020-002]) a flame a forest fire a human being a hurricane a photon a puff of smoke a sea wave a tornado an aggregate of human beings. an energy wave an epidemic every entity of which a material entity is continuant part is also a material entity. (axiom label in BFO2 Reference: [021-002]) the undetached arm of a human being