Reductivity properties over an affine base
arXiv:1910.13749 · doi:10.1016/j.indag.2020.09.009
Abstract
When the base ring is not a field, power reductivity of a group scheme is a basic notion, intimately tied with finite generation of subrings of invariants. Geometric reductivity is weaker and less pertinent in this context. We give a survey of these properties and their connections.
6 pages; Dedicated to the memory of T.A. Springer