## ::Mathematical constant

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

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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
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}}</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

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