Definition:Complete Elliptic Integral of the First Kind/Definition 2

Special Function

 * $\ds \map K k = \int \limits_0^1 \frac {\d v} {\sqrt {\paren {1 - v^2} \paren {1 - k^2 v^2} } }$

is the complete elliptic integral of the first kind, and is a function of $k$, defined on the interval $0 < k < 1$.

Also see

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