# Neumann problem for Hessian equations

The Dirichlet problem for nonlinear elliptic Hessian equations was solved by Caffarelli-Nirenberg-Spruck in the rather general domain in 1985. In 1986, Lions-Trudinger-Urbas got an existence theorem for the Monge-Ampere equation with Neumann boundary condition in uniformly convex domain, Urbas also studied the Neumann or oblique derivative problem for some class of fully nonlinear elliptic equations. When the domain is a ball, Trudinger also obtained an existence result for the Hessian equations with Neumann boundary problem. In this talk, we shall prove the existence of a classical solution to a Neumann boundary problem for Hessian equations in uniformly convex domain. The methods depend upon the established a priori derivative estimates up to order two. This is a joint works with Qiu Guohuan.