50 citations · 101 across the 13 of their papers we have counts for
Showing 2009Show all
3 papers · 1 filter
math.AG2009★ 15 cited
Approximating classifying spaces by smooth projective varieties
Torsten Ekedahl
We prove that for every reductive algebraic group with centre of positive dimension and every integer there is a smooth and projective variety and an algebraic -tors…
math.AG2009★ 50 cited
The Grothendieck group of algebraic stacks
Torsten Ekedahl
We introduce a Grothendieck group of algebraic stacks (with affine stabilisers) analogous to the Grothendieck group of algebraic varieties. We then identify it with a certain local…
math.AG2009★ 21 cited
A geometric invariant of a finite group
Torsten Ekedahl
We study the class of the classifying stack of a finite group in a Grothendieck group of algebraic stacks introduced previously. We show that this class is trivial in a number of e…