3 papers
math.LO2006
Completions of countable non-standard models of Q
Peter Laubenheimer, Thomas Schick, Ulrich Stuhler
In this note, we study non-standard models of the rational numbers with countably many elements. These are ordered fields, and so it makes sense to complete them, using non-standar…
math.AG2004
Moduli schemes of generically simple Azumaya modules
Norbert Hoffmann, Ulrich Stuhler
Let A be an Azumaya algebra over a smooth projective variety X or more generally, a torsion free coherent sheaf of algebras over X whose generic fiber is a central simple algebra.…
math.AG2004
Moduli Stacks of Vector Bundles and Frobenius Morphisms
Frank Neumann, Ulrich Stuhler
We describe the action of the different Frobenius morphisms on the cohomology ring of the moduli stack of algebraic vector bundles of fixed rank and determinant on an algebraic cur…