Motivated by the study of the non-parametric area of the graph of the vortex map u (a two-codimensional singular surface in) over the disk of radius l, we perform a careful analysis of the singular part of the relaxation of computed at u. The precise description is given in terms of an area-minimizing surface in a vertical copy of, which is a sort of “catenoid” containing a segment corresponding to a radius of Ω. The problem involves an area-minimization with a free boundary part; several boundary regularity properties of the minimizer are inspected.
