Specifies an N-ary mathematical object, such As Summation and Integral. It consists of an operator, a bAse (or operand), and optional upper and lower limits. Examples of N-ary operators are: Summation, Union, Intersection, Integral...Specifies an N-ary mathematical object, such as Summation and Integral. It consists of an operator, a base (or operand), and optional upper and lower limits. Examples of N-ary operators are: Summation, Union, Intersection, Integral