Quasilinear problems with singularities.
In these notes, we will describe recent work on globally solving quasilinear wave equations in the presence of trapped rays, on Kerr-de Sitter space, and obtaining the asymptotic behavior of solutions. For the associated linear problem without trapping, one would consider a global, non-elliptic, Fredholm framework; in the presence of trapping the same framework is available for spaces of growing functions only. In order to solve the quasilinear problem we thus combine these frameworks with the normally...
We give some expansion formulas and the Kelvin principle for solutions of a class of iterated equations of elliptic type
We give some fundamental solutions of a class of iterated elliptic equations including Laplace equation and its iterates.