Category:Kei Function

This category contains results about Kei Function.
Definitions specific to this category can be found in Definitions/Kei Function.

Let $K_n$ denote the modified Bessel function of the second kind.

The Kei function is defined as:

$\map {\Kei_n} x = \map \Im {\map {K_n} {x \map \exp {\dfrac {\pi i} 4} } }$

where:

$\exp$ denotes the exponential function

$x$ is real

$\map \Im z$ denotes the imaginary part of $z$.