Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Good formal structure for meromorphic flat connections on smooth
  projective surfaces   We prove the algebraic version of a conjecture of C. Sabbah on the existence
of the good formal structure for meromorphic flat connections on surfaces after
some blow up.

30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn