Armin Rainer

collaborators

2 papers

math.CA2020

Sobolev Lifting over Invariants

Adam Parusiński, Armin Rainer

We prove lifting theorems for complex representations $V$ of finite groups $G$ . Let $σ = (σ_{1}, \dots, σ_{n})$ be a minimal system of homogeneous basic invariants and let $d$ be their max…

math.DG2006

Orbit projections as fibrations

Armin Rainer

The orbit projection $π : M \to M / G$ of a proper $G$ -manifold $M$ is a fibration if and only if all points in $M$ are regular. Under additional assumptions we show that $π$ is a qua…