The idea to find first integrals for polynomial vector fields via algebraic invariant curves can be traced back to Darboux in the 19th century. In 1983, ..
We prove comparison, uniqueness and existence results for viscosity solutions nto a wide class of fully nonlinear second order partial differential equations..
Finite dierence approximations of the second derivative in space appearing in, parabolic, incompletely parabolic systems of, and second order hyperbolic, part..