<Li> ÷, obelus (division) </Li> <Li> ×, times (multiplication) </Li> <P> In mathematics, an operation is a calculation from zero or more input values (called operands) to an output value . The number of operands is the arity of the operation . The most commonly studied operations are binary operations of arity 2, such as addition and multiplication, and unary operations of arity 1, such as additive inverse and multiplicative inverse . An operation of arity zero, or 0 - ary operation is a constant . The mixed product is an example of an operation of arity 3, or ternary operation . Generally, the arity is supposed to be finite, but infinitary operations are sometimes considered . In this context, the usual operations, of finite arity are also called finitary operations . </P> <P> There are two common types of operations: unary and binary . Unary operations involve only one value, such as negation and trigonometric functions . Binary operations, on the other hand, take two values, and include addition, subtraction, multiplication, division, and exponentiation . </P>

A calculation from input values such as add subtract multiply and divide