Configurations of Linear Spaces of Codimension Two and the Containment Problem

On Codimension Two Flats in Fermat-Type Arrangements

“…During preparations of this manuscript we were informed that Ben Drabkin [2] found another proof of the non-containment Theorem 4.1. Since his methods are completely different from ours we have decided to include a full proof of Theorem 4.1 also because it reveals particular symmetries of the ideals we handle here.…”