H. Flenner

activity

19992005

most citedLocally nilpotent derivations on affine surfaces with a $\C^*$-action

44 citations · 52 across the 7 of their papers we have counts for

collaborators

Showing 2005Show all

3 papers · 1 filter

math.AC2005

Power series rings and projectivity

R. -O. Buchweitz, H. Flenner

We show that a formal power series ring $A [[X]]$ over a noetherian ring $A$ is not a projective module unless $A$ is artinian. However, if $(A, m)$ is local, then $A[[X]…

math.AG2005

On a result of Miyanishi-Masuda

Hubert Flenner, Mikhail Zaidenberg

Let $X$ be an affine surface admitting a unique affine ruling and a $C^{*}$ -action. Assume that the ruling has a unique degenerate fibre and that this fibre is irreducible. I…

math.AC2005

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 $f : M \to N$ over a local noetherian ring $(A, m)$ . We show for instance…