Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the positivity of Green's functions for a class of
  pseudo-differential operators on closed Riemannian, manifolds   This paper is being withdrawn because another paper by the author makes it
obsolete. See comments for directions to new paper.

32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics