3 papers
math.AG2017
A Tannakian classification of torsors on the projective line
Johannes Anschütz
In this small note we present a Tannakian proof of the theorem of Grothendieck-Harder on the classification of torsors under a reductive group on the projective line over a field.
math.NT2017
Reductive group schemes over the Fargues-Fontaine curve
Johannes Anschütz
For an arbitrary non-archimedean local field we classify reductive group schemes over the corresponding Fargues-Fontaine curve by group schemes over the category of isocrystals. We…
math.AG2015
Descent of algebraic cycles
Johannes Anschütz
We characterize universally generalizing morphisms which satisfy descent of algebraic cycles integrally as those universally generalizing morphisms which are surjective with generi…