Abstract
In the theory of elliptic equations, the technique of Schwarz symmetrization is one of the tools used to obtain a priori bounds for classical and weak solutions in terms of general information on the data. A basic result says that, in the absence of the zero-order term, the symmetric rearrangement of the solution u of an elliptic equation, that we write u ⁄ , can be compared pointwise with the solution of the symmetrized problem. The main question we address here is the modiflcation of the method to take into account degenerate equations posed in inhomogeneous media. Moreover, the equations we want to deal with involve weights that make them non-divergent, at least when written in terms of the natural variables. We flnd comparison results covering the elliptic case and the corresponding evolution models of parabolic type, with attention to equations of porous medium type. More speciflcally, we obtain a priori bounds and decay estimates for wide classes of solutions of those equations.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.