Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A q-analogue of the four functions theorem   In this article we give a proof of a q-analogue of the celebrated four
functions theorem. This analogue was conjectured by Bjorner and includes as
special cases both the four functions theorem and also Bjorner's q-analogue of
the FKG inequality.

16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci