In mathematics, value may refer to several, strongly related notions.
In general, a mathematical value may be any definite mathematical object
. In elementary mathematics
, this is most often a number
– for example, a real number
such as or an integer
such as 42.
* The value of a variable
or a constant
is any number or other mathematical object assigned to it.
* The value of a mathematical expression
is the result of the computation described by this expression when the variables and constants in it are assigned values.
* The value of a function
, given the value(s) assigned to its argument
(s), is the quantity assumed by the function for these argument values.
For example, if the function is defined by , then assigning the value 3 to its argument yields the function value 10, since .
If the variable, expression or function only assumes real
values, it is called real-valued. Likewise, a complex-valued variable, expression or function only assumes complex value
* Value function
* Value (computer science)
* Absolute value
* Truth value