object aggregate ObjectAggregate The unit can, at certain times, consist of exactly one object, for example, when a wolf litter loses all but one of its pups, but it must at some time have a plurality of member parts. An entity a is an object aggregate if and only if there is a mutually exhaustive and pairwise disjoint partition of a into objects 'Exactly' means that there are no parts of the object aggregate other than its member parts. (Elucidation) An object aggregate is a material entity consisting exactly of a plurality (≥1) of objects as member parts which together form a unit ISBN:978-3-938793-98-5pp124-158#Thomas Bittner and Barry Smith, 'A Theory of Granular Partitions', in K. Munn and B. Smith (eds.), Applied Ontology: An Introduction, Frankfurt/Lancaster: ontos, 2008, 125-158. (forall (x) (if (ObjectAggregate x) (and (MaterialEntity x) (forall (t) (if (existsAt x t) (exists (y z) (and (Object y) (Object z) (memberPartOfAt y x t) (memberPartOfAt z x t) (not (= y z)))))) (not (exists (w t_1) (and (memberPartOfAt w x t_1) (not (Object w)))))))) // axiom label in BFO2 CLIF: [025-004] object-aggregate 025-BFO BFO 2 Reference: object aggregates may gain and lose parts while remaining numerically identical (one and the same individual) over time. This holds both for aggregates whose membership is determined naturally (the aggregate of cells in your body) and aggregates determined by fiat (a baseball team, a congressional committee). The aggregate of the musicians in a symphony orchestra and their instruments; the aggregate of bearings in a constant velocity axle joint; the nitrogen atoms in the atmosphere; a collection of cells in a blood biobank a collection of cells in a blood biobank. a swarm of bees is an aggregate of members who are linked together through natural bonds a symphony orchestra an organization is an aggregate whose member parts have roles of specific types (for example in a jazz band, a chess club, a football team) b is an object aggregate means: b is a material entity consisting exactly of a plurality of objects as member_parts at all times at which b exists. (axiom label in BFO2 Reference: [025-004]) defined by fiat: the aggregate of members of an organization defined through physical attachment: the aggregate of atoms in a lump of granite defined through physical containment: the aggregate of molecules of carbon dioxide in a sealed container defined via attributive delimitations such as: the patients in this hospital the aggregate of bearings in a constant velocity axle joint the aggregate of blood cells in your body the nitrogen atoms in the atmosphere the restaurants in Palo Alto your collection of Meissen ceramic plates. material entity material entity