Bessel function K(n,z) (McDonald's function)
is the solution of the modified Bessel equation
which is singular at z=0 and has the following behavior at positive
infinity:
It admits the following integral representation:
n-index, z-argument
MathMate syntax: K(n,z)
Domain: n an integer, z positive real
Note: If the index is given as a non-integer number MathMate
rounds it towards negative infinity.
See also: