A. Rainer

activity

20032026

most citedComposition in ultradifferentiable classes

62 citations · 389 across the 51 of their papers we have counts for

collaborators

Showing 2007Show all

3 papers · 1 filter

math.DG2007

Orbit projections of proper Lie groupoids as fibrations

Armin Rainer

Let $G ⇉ M$ be a source locally trivial proper Lie groupoid such that each orbit is of finite type. The orbit projection $M \to M / G$ is a fibrat…

math.RT2007

Invariant functions in Denjoy-Carleman classes

Armin Rainer

Let $V$ be a real finite dimensional representation of a compact Lie group $G$ . It is well-known that the algebra $R [V]^{G}$ of $G$ -invariant polynomials on $V$ is finitely g…

math.CA2007

Smooth multiparameter perturbation of polynomials and operators

Mark Losik, Peter W. Michor, Armin Rainer

This paper has been withdrawn by the authors due to a gap in the proof of the main result (in 5.3).