hankel1( *n* , *z* )

The Hankel function of the first kind of *z* in SageMath. Defined in terms of Bessel functions by

Plot of the real part on the real axis:

Plot of the imaginary part on the real axis:

Series expansion about the origin:

Special values:

Related functions: hankel2 bessel_J bessel_Y

Function category: Bessel functions sagemath-docs