## ::Mathematical constant

### ::concepts

Style::constant    Number::center    Right::align    Theory::title    Number::square    Class::value

{{#invoke:broader|broader}} A mathematical constant is a special number, usually a real number, that is "significantly interesting in some way".<ref name="mathworld">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Constants arise in many areas of mathematics, with constants such as e and π occurring in such diverse contexts as geometry, number theory, and calculus.

What it means for a constant to arise "naturally", and what makes a constant "interesting", is ultimately a matter of taste, and some mathematical constants are notable more for historical reasons than for their intrinsic mathematical interest. The more popular constants have been studied throughout the ages and computed to many decimal places.

All mathematical constants are definable numbers and usually are also computable numbers (Chaitin's constant being a significant exception).

Mathematical constant sections
Intro   Common mathematical constants    Constants in advanced mathematics    Mathematical curiosities and unspecified constants    Notation    Table of selected mathematical constants   See also  Notes   External links

 PREVIOUS: Intro NEXT: Common mathematical constants << >>