bessel_I( n , z )
The modified Bessel function of the first kind of z in SageMath. Defined by
\[ I_n(z) = i^{-n} J_n(iz) \]A solution of the differential equation
\[ \frac{d^2 f}{dz^2} + \frac{1}{z} \frac{df}{dz} - \left[ 1 + \frac{n^2}{z^2} \right] f = 0 \]The second linearly independent solution of this equation for integer order is bessel_K.
Plot on the real axis:
Series expansion about the origin:
Special values:
Related functions: bessel_K
Function category: Bessel functions sagemath-docs