Perron's method for nonlocal fully nonlinear equations
  This paper is concerned with existence of viscosity solutions of non-translation invariant nonlocal fully nonlinear equations. We construct a discontinuous viscosity solution of such nonlocal equation by Perron's method. If the equation is uniformly elliptic in the sense of \cite{SS}, we prove the discontinuous viscosity solution is H\"older continuous and thus it is a viscosity solution. 
Chenchen Mou
math.AP