BesselY

BesselY[n, z] gives the Bessel function of the second kind Y_n(z), also called the Neumann function.

Examples

Bessel Y function:

N[BesselY[0, 1]]
(* 0.0882570 *)

N[BesselY[1, 2]]
(* -0.107032 *)

Divergent at zero:

N[BesselY[0, 0.1]]
(* -1.53424 *)

Please visit the official Wolfram Language Reference for more details.