44 citations · 52 across the 7 of their papers we have counts for
12 papers
Power series rings and projectivity
R. -O. Buchweitz, H. Flenner
We show that a formal power series ring over a noetherian ring is not a projective module unless is artinian. However, if is local, then $A[[X]…
On a result of Miyanishi-Masuda
Hubert Flenner, Mikhail Zaidenberg
Let be an affine surface admitting a unique affine ruling and a -action. Assume that the ruling has a unique degenerate fibre and that this fibre is irreducible. I…
Codimension and connectedness of degeneracy loci over local rings
Hubert Flenner, Bernd Ulrich
We deduce results on the dimension and connectedness of degeneracy loci of maps of finite modules over a local noetherian ring . We show for instance…
On the uniqueness of -actions on affine surfaces
Hubert Flenner, Mikhail Zaidenberg
We prove that a normal affine surface over admits an effective action of a maximal torus () such that any other effective -act…
Locally nilpotent derivations on affine surfaces with a $\C^*$-action
Hubert Flenner, Mikhail Zaidenberg
We give a classification of normal affine surfaces admitting an algebraic group action with an open orbit. In particular an explicit algebraic description of the affine coordinate…
A Note on Generic Projections
Hubert Flenner, Mirella Manaresi
Let be a subvariety of dimension and a generic point. If the tangent variety Tan is equal to then for…