Minimal Singularities in GLn.
Moduli spaces of decomposable morphisms of sheaves and quotients by non-reductive groups
We extend the methods of geometric invariant theory to actions of non–reductive groups in the case of homomorphisms between decomposable sheaves whose automorphism groups are non–reductive. Given a linearization of the natural action of the group on Hom(E,F), a homomorphism is called stable if its orbit with respect to the unipotent radical is contained in the stable locus with respect to the natural reductive subgroup of the automorphism group. We encounter effective numerical conditions for...
Moduli-stacks for bundles on semistable curves.
Monodromy of functions defined on isolated singularities of complete intersections