Ngubane, Sizwe Remington2006-11-142006-11-142006-11-14http://hdl.handle.net/10539/1677Student Number : 9701675D - MSc dissertation - School of Mathematics - Faculty of ScienceThe role of invariants in obtaining exact solutions of dierential equations is reviewed. The examples considered are nonlinear evolution type equations like the Fisher and Fitzhugh-Nagumo equations. Finally, we look directly at an equation (formulated) governing some non-Newtonian uid in a rotating system.197151 bytesapplication/pdfeninvariantsevolution equaitonsThesis