34 citations
4 papers
Slices for lifted tangent and cotangent actions
Johannes Huebschmann
Given a Lie group G, a G-manifold M, and a point b of M with compact stabilizer, we construct slices for the lifted tangent and cotangent actions at a pre-image of b in terms of a…
Jump of Milnor numbers
Arnaud Bodin
In this note we study a problem of A'Campo about the minimal non-zero difference between the Milnor numbers of a germ of plane curve and one of its deformation.
Constrained von Neumann inequalities
Catalin Badea, Gilles Cassier
An equivalent formulation of the von Neumann inequality states that the backward shift on is extremal, in the sense that if is a Hilbert space contraction, the…
On the generalized Riemann-Hilbert problem with irregular singularities
A. A. Bolibruch, S. Malek, C. Mitschi
We give sufficient conditions, on data including the monodromy representation, the Stokes matrices and the Poincare ranks at prescribed singularities, to solve the generalized Riem…