Definition:Hypergeometric Function

Definition
A generalized hypergeometric function is a function which can be defined in the form of a hypergeometric series defined as:


 * $\ds {}_m \operatorname F_n \left({ {a_1, \ldots, a_m} \atop {b_1, \ldots, b_n} } \, \middle \vert {\, z}\right) = \sum_{k \mathop = 0}^\infty \dfrac { {a_1}^{\overline k} \cdots {a_m}^{\overline k} } { {b_1}^{\overline k} \cdots {b_n}^{\overline k} } \dfrac {z^k} {k!}$

where $x^{\overline k}$ denotes the $k$th rising factorial power of $x$.

When $m = 2$ and $n = 1$, the function is simply referred to as a hypergeometric function (or Gauss' hypergeometric function):
 * $\ds \map { {}_2F_1} {a, b; c; z} = \sum_{k \mathop = 0}^\infty \dfrac { a^{\overline k} b^{\overline k} } { c^{\overline k} } \dfrac {z^k} {k!}$