Wavefronts for degenerate diffusion-convection reaction equations with sign-changing diffusivity

<p style='text-indent:20px;'>We consider in this paper a diffusion-convection reaction equation one space dimension. The main assumptions are about the term, which is monostable, and diffusivity, changes sign once or even more than once; then, we deal with forward-backward parabolic equation. Our results concern existence of globally defined traveling waves, connect two equilibria cross both regions where diffusivity positive it negative. We also investigate monotony profiles show appearance sharp behaviors at points degenerates. In particular, if such interior points, then new unusual.</p>