%0 Journal Article %T A priori estimates for the obstacle problem of Hessian type equations on Riemannian manifolds %A Tingting Wang %A WeiSong Dong %A Gejun Bao %J Mathematics %D 2014 %I arXiv %X We are concerned with a priori estimates for the obstacle problem of a wide class of fully nonlinear equations on Riemannian manifolds. We use new techniques introduced by Bo Guan and derive new results for a priori second order estimates of its singular perturbation problem under fairly general conditions. By approximation, the existence of a C^{1,1} viscosity solution is proved. %U http://arxiv.org/abs/1412.6874v2