The cylinder over the Koras-Russell cubic threefold has a trivial Makar-Limanov invariant

2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/165769We show that the Makar-Limanov invariant of the cylinder over the Koras-Russell cubic affine threefold is trivial. This means that regular functions which are invariant under all algebraic actions of the additive group on this variety are constants.Algebraic Geometry14R10, 14R20The cylinder over the Koras-Russell cubic threefold has a trivial Makar-Limanov invarianttext