# Mathematical Constant

(Redirected from mathematical constant)

## References

### 2009

• (Wikipedia, 2009) ⇒ http://en.wikipedia.org/wiki/Constant
• A constant in mathematics is an amount that does not change, over time or otherwise: it is a fixed value. In most fields of discourse the term is an antonym of "variable", but in mathematical parlance a mathematical variable may sometimes also be called a constant.
• More particularly, the term constant has several uses:
• In mathematics and computer science:
• In physics and chemistry:
• Physical constant, a physical quantity that is generally believed to be both universal in nature and constant in time, such as $\displaystyle{ c }$, the speed of light, or $\displaystyle{ h }$, the Planck constant.
• Cosmological constant, usually denoted by Λ, a parameter modifying the original equations of the theory of general relativity, introduced by Einstein and important for determining the ultimate fate of the universe as predicted by the theory
• Time constant, usually denoted by τ, a value characterizing the frequency response of a first-order, linear time-invariant system
• Reaction rate constant, often denoted $\displaystyle{ k }$ or λ, a value characterizing the speed of a chemical reaction
• People named Constant: