Exact Solutions for Burgers-Fisher Equation

The hyperbolic function method has been used to study new exact travelling wave solutions for a class of nonlinear evolution equation u t-du xx +auu x+b(u 2-u)=0.The basic idea of this method is based on the fact that solitary wave solution of the nonlinear evolution equations are essentially of a localized property.Because the travelling wave solution can be assumed the polynomial form of the hyperbolic functions,the resultant solutions are obtained by solving a systems of nonlinear algebraic equations.