Purely inseparable coverings of rational double points in positive characteristic
arXiv:2003.10344 · doi:10.5427/jsing.2022.24b
Abstract
We classify purely inseparable morphisms of degree between rational double points (RDPs) in characteristic . Using such morphisms, we refine a result of Artin that any RDP admits a finite smooth covering.
16 pages, title slightly changed, accepted version