Inserted: 10 nov 2017
Last Updated: 10 jan 2018
Journal: ESAIM Control Optim. Calc. Var.
In this article we prove that the codimension of the abnormal set of the endpoint map for certain classes of Carnot groups of step 2 is at least three. Our result applies to all step 2 Carnot groups of dimension up to 7 and is a generalisation of a previous analogous result for step 2 free nilpotent groups.