This was taken one night after a few hours of nuclear engineering homework. In particular, I was working on a solution of the Boltzmann Transport equation; the equation for angular flux that nuclear engineers use is similar to the mechanical engineering version for heat trasport. It is impossible to solve analytically in any discipline! Only with a few modifications and simplifications can one even attempt to solve it. So, for all the prospective nuclear engieering students out there, this is what you have to look forward to -- solve it and you automatically win the Nobel Prize.