5 papers
Cohomological Hall algebras of one-dimensional sheaves on surfaces and Yangians
Duiliu-Emanuel Diaconescu, Mauro Porta, Francesco Sala +2
This paper provides the first algebraic characterization of an algebra of cohomological Hecke operators associated with modifications of coherent sheaves on a smooth surface al…
On a Riemann-Roch formula for stacks with finite cyclotomic inertia
Francesco Sala
B. Toen defined a Riemann-Roch map from the rational algebraic K-theory of a tame Deligne-Mumford quotient stack to the étale K-theory of its inertia. He proved that this map is a…
On a formula for the equivariant Euler characteristic of a -sheaf
Qiangru Kuang, Francesco Sala
H. Fischbacher-Weitz and B. Köck computed the equivariant Euler characteristic of a sheaf on a -curve over a field. Using a form of the Riemann-Roch theorem for quotien…
The geometric K-theory of quotient stacks
Francesco Sala, Laurent Schadeck, Angelo Vistoli
Given a quotient of a regular noetherian separated algebraic space over a field by an affine algebraic group having finite stabilizers (with some mild technical conditions)…
On a decomposition theorem in equivariant generalized homology theories for finite group actions
Francesco Sala
A. Vistoli proved a decomposition theorem for the rational equivariant algebraic K-theory of a variety under the action of a finite group . We generalize his result to more gene…