FunctionZeros.bessel_zero_asymptotic — Function
bessel_zero_asymptotic(nu, n, kind=1)

Asymptotic formula for the nth zero of the the Bessel J (Y) function of order nu. kind == 1 (2) for Bessel function of the first (second) kind, J (Y).

FunctionZeros.besselj_zero — Method
besselj_zero(nu, n; order=2)

nth zero of the Bessel J function of order nu, for n = 1,2,....

order is passed to the function Roots.fzero.

FunctionZeros.bessely_zero — Method
bessely_zero(nu, n; order=2)

nth zero of the Bessel Y function of order nu, for n = 1,2,....

order is passed to the function Roots.fzero.