Originally Posted by

**penguinick** I found the following solution to a differential equation problem but need to simplify it:

K0(A*x)/K0(A*B)

where K0 is the modified Bessel function of the second kind with alpha = 0, x is the independent variable, and A and B are constants. I'm only interested in the interval x>=B.

So far, I've tried to use the definitions of the Bessel functions to replace K0s with I0s with J0s, or K0s with H0s with J0s, but I frequently wind up with zeroes top and bottom. Any tips or solutions?