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Parents 
abstract 
Properties or qualities as distinguished from any particular embodiment of the properties/qualities in a physical medium. Instances of Abstract can be said to exist in the same sense as mathematical objects such as sets and relations, but they cannot exist at a particular place and time without some physical encoding or embodiment.

Children 
mathematical model  A model that uses the mathematical aparatus 
 multipole  Basic element of a multipole diagram, a multipole is a model of a component of a dynamic system, it can model a real separable component, such as a motor of a vehicle, or just an attribute of the system, such as inertia or friction, multipole interacts with other multipoles through its poles. 
 multipole model  Model of a physical system consisting of mutually interconnected multipoles. 
 multipole pole  A part of multipole pole that models a single energetical interaction. If a pole belongs to a multipole, it also belongs to one of its sections. 
 multipole section  A set of poles that is subject to the postulate of continuity. A multipole may consist of one or more sections. Sections of a single multipole do not overlap and cover all its poles. 