#set  (mathematics) an abstract collection of numbers or symbols; "the set of prime numbers is infinite"
  subtype:  interval  mathematical_group  locus  subset  null_set  topological_space  field.set  solution.set  diagonal  domain  geometric_intersection
  supertype:  collection  something gathering separated things (entities/situations)
     supertype:  divisible_entity__divisibleentity  many classifications under this category are application-dependant
        supertype:  entity  something that can be "involved" in a situation
           supertype:  thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
        supertype:  divisible_thing__divisiblething
           supertype:  thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

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