#mathematical_function__function  a mathematical relation such that each element of one set is associated with at least one element of another set
  subtype:  inverse_function  Kronecker_delta  transformation.mathematical_function  mapping  operator  trigonometric_function  threshold_function  exponential_function
  Z:  process
  supertype:  mathematical_relation  a relation between mathematical expressions (such as equality or inequality)
     supertype:  relation  an abstraction belonging to or characteristic of two entities or parts together
        supertype:  thing_that_can_be_seen_as_a_relation  usable as relation type
           supertype:  thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
              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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