represents the k^(th) zero of the Bessel function of the second kind .


represents the k^(th) zero greater than x0.


  • Mathematical function, suitable for both symbolic and numerical manipulation.
  • N[BesselYZero[n,k]] gives a numerical approximation so long as the specified zero exists.
  • BesselYZero[n,k] represents the k^(th) zero greater than 0.
  • BesselYZero can be evaluated to arbitrary numerical precision.
  • BesselYZero automatically threads over lists.


open allclose all

Basic Examples  (5)

Evaluate numerically:

Evaluate symbolically:

Display zeros of the BesselY function over a subset of the reals:

Series expansion at the origin:

TraditionalForm formatting:

Scope  (17)

Numerical Evaluation  (6)

Evaluate numerically:

Find the first zero of greater than 50:

Evaluate to high precision:

Evaluate efficiently at high precision:

Evaluate at a noninteger second argument:

For BesselYZero[ν,k-α/π], the result is a zero of :

BesselYZero threads elementwise over lists:

Specific Values  (3)

Limiting value at infinity:

The first three zeros:

Find the first zero of BesselY[1,x] using Solve:

Visualization  (3)

Visualize the zeroes of BesselY as a step function:

Display zeros of the BesselY function:

Show the first zero greater than 4:

Differentiation and Series Expansions  (5)

Derivative of Bessel zero with respect to k:

Second derivative:

Find the Taylor expansion using Series:

Find the series expansion at Infinity:

Taylor expansion at a generic point:

Properties & Relations  (1)

Asymptotic behavior of BesselYZero[ν,k] for large k:

Introduced in 2007