gamma-0.10.0.0: README.md

Gamma
=========

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`gamma` is a number theory package written in Haskell that aims to provide its users
with the following functionality:

* A typeclass
  ```haskell
  class Num a => Factorial a
  ```
  that provides a [`factorial`](https://en.wikipedia.org/wiki/Factorial) function.
* A typeclass
  ```haskell
  class (Eq a, Floating a, Factorial a) => Gamma a
  ```
  that provides the functions
  + [`gamma`](https://en.wikipedia.org/wiki/Gamma_function)
  + `lnGamma` (natural logarithm of the gamma function) and
  + `lnFactorial` (natural logarithm of the factorial function).
* A typeclass
  ```haskell
  class Gamma a => IncGamma a
  ```
  for the [incomplete lower and upper gamma functions](https://en.wikipedia.org/wiki/Incomplete_gamma_function).
* A typeclass
  ```haskell
  class Gamma a => GenGamma a
  ```
  to represent the [multivariate gamma function](https://en.wikipedia.org/wiki/Multivariate_gamma_function).