Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Detecting projectivity in sheaves associated to representations of
  infinitesimal groups   Let G be an infinitesimal group scheme of finite height r and V(G) the scheme
which represents 1-parameter subgroups of G. We consider sheaves over the
projectivization P(G) of V(G) constructed from a G-module M. We show that if
P(G) is regular then the sheaf H^[1](M) is zero if and only if M is projective.
In general, H^[1] defines a functor from the stable module category and we
prove that its kernel is a thick triangulated subcategory. Finally, we give
examples of G such that P(G) is regular and indicate, in characteristic 2, the
connection to the BGG correspondence. Along the way we will provide new proofs
of some known results and correct some errors in the literature.

13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom