#field.set  (mathematics) a set of elements such that addition and multiplication are commutative and associative and multiplication is distributive over addition and there are two elements 0 and 1; "the set of all rational numbers is a field"
  subtype:  #scalar_field  a field of scalars
  supertype:  #set  (mathematics) an abstract collection of numbers or symbols; "the set of prime numbers is infinite"
     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

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