BesselJ

BesselJ[n, z] gives the Bessel function of the first kind J_n(z).

Examples

Bessel function values:

BesselJ[0, 0]
(* 1 *)

BesselJ[1, 0]
(* 0 *)

Numerical evaluation:

N[BesselJ[0, 1]]
(* 0.765198 *)

N[BesselJ[1, 2]]
(* 0.576725 *)

Please visit the official Wolfram Language Reference for more details.