Dominic Bunnett › The non-reductive zoo
The non-reductive zoo
A collection of examples and curious phenomena in non-reductive group actions and invariant theory.
Each cage below houses one example.
- Nagata’s counterexample to finite generation How Nagata’s theorem on plane curves produces a linear representation of a vector group whose invariant ring is not finitely generated.
- Roberts’ counterexample to finite generation A nonlinear additive-group action on affine seven-space with a non-finitely generated invariant ring.
No matching items