We study the structure of stationary solutions to the Doi-Onsager
equation with Maier-Saupe potential on the sphere, which arises in
the modelling of rigid rod-like molecules of polymers. The stationary
solutions are shown to be necessarily a set of axially symmetric
functions, and a complete classification of parameters for phase
transitions to these stationary solutions is obtained. It is shown
that the number of stationary solutions hinges on whether the
potential intensity crosses two critical values LOOK HERE!!!![PROPORTIONAL TO??]
1 about 6.731393 and LOOK HERE!!!![PROPORTIONAL TO??]2=7.5.
Furthermore, we present explicit formulas for all stationary solutions.