Urbas, John2015-12-080944-2669http://hdl.handle.net/1885/36564We show that W 2,p weak solutions of the k-Hessian equation F k (D 2 u) = g(x) with k ≥ 2 can be approximated by smooth k-convex solutions v j of similar equations with the right hands sides controlled uniformly in C 0,1 norm, and so that the quantities200710.1007/s00526-006-0064-72015-12-08