#identity_operator__identity__identity_element  an operator that leaves unchanged the element on which it operates; "the identity under numerical multiplication is 1"
  supertype:  operator  (mathematics) a symbol that represents a function from functions to functions; "the integral operator"
     supertype:  mathematical_function__function  a mathematical relation such that each element of one set is associated with at least one element of another set
        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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