Regularity theory for fully nonlinear oblique transmission problems

We develop a regularity theory for fully nonlinear oblique transmission problems. Our main result establishes the optimal regularity of viscosity solutions for flat interfaces. For constant-coefficient equations, we prove that viscosity solutions are piecewise $C^{1,\alpha }$ up to the interface. The same regularity continues to hold for variable-coefficient problems, with sufficiently regular coefficients, in a more restrictive class of viscosity solutions. This is the first regularity result for variable-coefficient transmission conditions.