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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

abstraction, abstract entity go
a general concept formed by extracting common features from specific examples

relation go
an abstraction belonging to or characteristic of two entities or parts together

mathematical relation go
a relation between mathematical expressions (such as equality or inequality)

function, mapping, map, mathematical function, single-valued function go
(mathematics) a mathematical relation such that each element of a given set (the domain of the function) is associated with an element of another set (the range of the function)

operator
(mathematics) a symbol or function representing a mathematical operation

noun.relation

2 Subcategories

linear operator go
an operator that obeys the distributive law: A(f+g) = Af + Ag (where f and g are functions)
identity, identity element, identity operator go
an operator that leaves unchanged the element on which it operates