of (2') exists, if f(r) = g(r) ■ D(r). Both solutions have the same speed and are related through a
transformation of coordinates which can be explicitly given as soon as one of the solutions is
known. We also show that, in this case, V (resp. U) can also be obtained as a … More
generally, the existence results for travelling wave solutions in [3] (case D(u) = u", g(u) = u-(\-u)) …