Weighted blow-up desingularization of plane curves

Abstract: Given a singular hypersurface in a regular 2-dimensional scheme essentially of finite type over a field, we construct an embedded resolution of singularities by tame Artin stacks. This applies in particular to plane curves. The key tool is Hironaka's characteristic polyhedron from which we determine a suitable center for a stack-theoretic weighted blow-up. In particular, we show that the order strictly decreases at every point lying above the center. In contrast to earlier work by the authors, we do not have to restrict to perfect base fields and we deduce an inductive argument, despite the fact that higher dimensional tangent spaces arise, by taking torus actions and equivariant centers into account. Hence, we work with weighted blow-ups of tame Artin stacks and we do not have to pass to multi-weighted blow-ups of Deligne--Mumford stacks.