27 citations · 51 across the 16 of their papers we have counts for
23 papers
G-torsors and universal torsors over nonsplit del Pezzo surfaces
Ulrich Derenthal, Norbert Hoffmann
Let S be a smooth del Pezzo surface that is defined over a field K and splits over a Galois extension L. Let G be either the split reductive group given by the root system of …
A birational Torelli theorem with a Brauer class
Norbert Hoffmann, Fabian Reede
Let denote the coarse moduli space of semistable vector bundles of rank with trivial determinant over a smooth projective cur…
On the rationality problem for forms of moduli spaces of stable marked curves of positive genus
Mathieu Florence, Norbert Hoffmann, Zinovy Reichstein
Let (respectively, ) be the moduli space of smooth (respectively stable) curves of genus with marked points. Over the field of complex numbe…
Stability of the Poincaré bundle
Indranil Biswas, Tomás L. Gómez, Norbert Hoffmann
Let X be an irreducible smooth projective curve, of genus at least two, over an algebraically closed field k. Let denote the moduli stack of principal G-bundles o…
Torsion-free rank one sheaves over del Pezzo orders
Norbert Hoffmann, Fabian Reede
Let A be a del Pezzo order on the projective plane over the field of complex numbers. We prove that every torsion-free A-module of rank one can be deformed into a locally free A-mo…
Degeneration of torsors over families of del Pezzo surfaces
Ulrich Derenthal, Norbert Hoffmann
Let S be a split family of del Pezzo surfaces over a discrete valuation ring such that the general fiber is smooth and the special fiber has ADE-singularities. Let G be the reducti…