22 citations · 69 across the 12 of their papers we have counts for
14 papers
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…
Formal Laurent series rings and the Hermite ring conjecture
Daniel Schäppi
We study the question if projective modules over formal Laurent series rings are extended. We relate this question to the Bass-Quillen conjecture for commutative regular local ring…
Flat replacements of homology theories
Daniel Schäppi
To a homology theory one can associate an additive site and a new homological functor with values in the category of additive sheaves on that site. If this category of sheaves can…
Graded-Tannakian categories of motives
Daniel Schäppi
Given a rigid tensor-triangulated category and a vector space valued homological functor for which the Künneth isomorphism holds, we construct a universal graded-Tannakian category…
Uniqueness of fiber functors and universal Tannakian categories
Daniel Schäppi
The principal aim of this note is to give an elementary proof of the fact that any two fiber functors of a Tannakian category are locally isomorphic. This builds on an idea of Deli…