sympy/sympy — pull request #999 by ness01 (2012-01-18 13:10:51+00:00)
Title: [simplify] Implement besselsimp.

In reference to issue 2917.

This commit adds (the start of) a routine for simplifying bessel-type functions.
It currently only works on besseli and besselj and only implements a very
simplistic algorithm. It however works nicely in many cases occurring in practice.

Add tests for this.

Also adapt some existing tests (mostly transforms) to the new, better simplification.