# Definition:Absolute Number

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## Definition

An **absolute number** is a number in an expression which has a single value.

It is either expressed using actual figures, in an agreed number system, or by a symbol which is understood to represent that specific number.

### Examples

- $2$, $\sqrt 5$, $1.976$, $\dfrac 2 3$, $\pi$ (pi), $e$ (Euler's number)

## Sources

- 1998: David Nelson:
*The Penguin Dictionary of Mathematics*(2nd ed.) ... (previous) ... (next): Entry:**absolute number** - 2008: David Nelson:
*The Penguin Dictionary of Mathematics*(4th ed.) ... (previous) ... (next): Entry:**absolute number**