The problem of determining the size and structure of the interior singular set of area-minimizing surfaces has been studied thoroughly in a number of different frameworks, with many ground-breaking contributions. In the framework of integral currents, when the codimension of the surface is higher than 1, the presence of singular points with flat tangent cones creates an obstruction to easily understanding the interior singularities. Little progress has been made in full generality since Almgren’s celebrated (m-2)-Hausdorff dimension bound on the singular set for an m-dimensional area-minimizing current, which was since revisited and simplified by De Lellis and Spadaro.

In this talk I will discuss joint works with Camillo De Lellis and Paul Minter, where we establish (m-2)-rectifiability of the interior singular set of an m-dimensional area-minimizing integral current and show that the tangent cone is unique at \mathcal{H}^{m-2}-a.e. interior point.