BesselK

BesselK[n, z] gives the modified Bessel function of the second kind K_n(z).

Examples

Modified Bessel K function:

N[BesselK[0, 1]]
(* 0.421024 *)

N[BesselK[1, 2]]
(* 0.139866 *)

Asymptotic behavior:

N[BesselK[0, 0.1]]
(* 2.42707 - large for small z *)

Please visit the official Wolfram Language Reference for more details.