Geometric regularity for semi-convex viscosity solutions to the special Lagrangian equation

We prove that the gradient graph of any $W^{2,1}$ semi-convex viscosity solution to the three-dimensional subcritical special Lagrangian equation is area-minimizing and smooth. Furthermore, we prove the smoothness of $W^{2,1}\cap C^{1,1\mathrm{/}3+}$ semi-convex viscosity solutions. This yields progress on the conjecture proposed by Wang–Yuan [WY13]. The corresponding results in higher dimensions are also established.