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Rigidity (time-indexed qualities or classifications) – Essential properties define an entity throughout its life – A ‘student’ : not a class but a time-indexed property of a person Identity (terms and classes) – A map vs a sketch vs an information object of type ‘map’ or ‘sketch’ Unity (parthood) – A crowd of humans vs a group having a plan Dependence (one instance implies the existence of another one) – No human without a brain, no human without a birth