Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Biduality and Reflexivity in Positive Characteristic   The biduality and reflexivity theorems are known to hold for projective
varieties defined over fields of characteristic zero, and to fail in positive
characteristic. In this article, we construct a notion of reflexivity and
biduality in positive characteristic by generalizing the ordinary tangent space
to the notion of $h$-tangent spaces. The ordinary reflexivity theory can be
recovered as the special case $h=0$, of our theory.
  Several varieties that are not ordinary reflexive or bidual become reflexive
in our extended theory.

11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph