#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:  pm#collection  something gathering separated things (entities/situations)
     supertype:  pm#divisible_entity__divisibleentity  many classifications under this category are application-dependant
        supertype:  pm#entity  something that can be "involved" in a situation
           supertype:  pm#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:  pm#divisible_thing__divisiblething
           supertype:  pm#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

No statement uses or specializes #set; click here to add one.