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

Sources

• 1968: Murray R. Spiegel: Mathematical Handbook of Formulas and Tables ... (previous) ... (next): $\S 34$: Elliptic Functions: Complete Elliptic Integral of the First Kind: $34.2$
• 2009: Murray R. Spiegel, Seymour Lipschutz and John Liu: Mathematical Handbook of Formulas and Tables (3rd ed.) ... (previous) ... (next): $\S 35$: Elliptic Functions: Complete Elliptic Integral of the First Kind: $35.2.$