The Engel-Lutz twist and overtwisted Engel structures
arXiv:1712.09286 · doi:10.2140/gt.2020.24.2471
Abstract
We introduce a modification procedure for Engel structures that is reminiscent of the Lutz twist in 3-dimensional Contact Topology. This notion allows us to define what an Engel overtwisted disc is, and to prove a complete h-principle for overtwisted Engel structures with fixed overtwisted disc.
59 pages, Details added, comments welcome