|WikiProject Mathematics||(Rated Start-class, Mid-importance)|
The definition favored by mathematicians ... Another definition, ... the reverse Bessel polynomials ...
The Bessel polynomial may also be defined using Bessel functions ... where ... yn(x) is the reverse polynomial
Please use the same notation for ordinary vs reverse throughout.
Bessel Polynomials by E. Grosswald does use y for reverse.
http://www.math.ku.dk/~berg/manus/bessel.pdf says "The polynomials θ n are sometimes called the reverse Bessel polynomials and y n (u) = u n θ n (1/u) the ordinary Bessel polynomials."
So we need to pick one and stick to it.