22 citations · 22 across the 2 of their papers we have counts for
4 papers
A counterexample to the Hermite ring conjecture
Daniel Schäppi
We show that there exists a stably free module over a polynomial ring which is not extended from the ground ring. This provides a counterexample to the Hermite ring conjecture.
Symplectic K-theory and a problem of Murthy
Daniel Schäppi
We compute low-dimensional K-groups of certain rings associated with the study of the Hermite ring conjecture. This includes a monoid ring whose low-dimensional K-groups were recen…
Flat functors in higher topos theory
George Raptis, Daniel Schäppi
For a small -category and an -topos , we study necessary and sufficient conditions for a functor to determin…
A characterization of categories of coherent sheaves of certain algebraic stacks
Daniel Schäppi
Under certain conditions, a scheme can be reconstructed from its category of quasi-coherent sheaves. The Tannakian reconstruction theorem provides another example where a geometric…