DLMF:

19 Elliptic Integrals Legendre’s Integrals 19.3 Graphics 19.3 Graphics 19.4 Derivatives and Differential Equations

Figure 19.3.10 (See in context.)

Figure 19.3.10: $\imagpart{(\mathop{K\/}\nolimits\!\left(k\right))}$ as a function of complex $k^{2}$ for $-2\leq\realpart{(k^{2})}\leq 2$ , $-2\leq\imagpart{(k^{2})}\leq 2$ . The imaginary part is 0 for $k^{2}<1$ , and is antisymmetric under reflection in the real axis. On the upper edge of the branch cut ( $k^{2}\geq 1$ ) it has the value $\mathop{K\/}\nolimits\!\left(k^{{\prime}}\right)$ if $k^{2}>1$ , and $\frac{1}{4}\pi$ if $k^{2}=1$ .

Annotations:

Symbols:: $\mathop{K\/}\nolimits\!\left(k\right)$ : Legendre’s complete elliptic integral of the first kind, $\imagpart{}$ : imaginary part, $\realpart{}$ : real part, : real or complex modulus and $k^{{\prime}}$ : complementary modulus
Permalink:: http://dlmf.nist.gov/19.3.F10.mag
Encodings:: Magnified png, VRML, X3D, pdf

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