Definition:Incomplete Elliptic Integral of the First Kind/Definition 1

Special Function

 * $\ds \map F {k, \phi} = \int \limits_0^\phi \frac {\d \phi} {\sqrt {1 - k^2 \sin^2 \phi} }$

is the incomplete elliptic integral of the first kind, and is a function of the variables:
 * $k$, defined on the interval $0 < k < 1$
 * $\phi$, defined on the interval $0 \le \phi \le \pi / 2$.

Also see

 * Equivalence of Definitions of Incomplete Elliptic Integral of the First Kind