Problems about torsors over regular rings (with an appendix by Yifei Zhao)
arXiv:2201.06424
Abstract
We overview a web of conjectures about torsors under reductive groups over regular rings and survey some techniques that have been used for making progress on such problems.
63 pages; final version, appeared in Acta Mathematica Vietnamica; added several footnotes that correct inaccuracies in the published version