Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Diagonalization of Fix-Mahonian Matrices   Consider the regular representation of the sum over all permutations weighted
by the sum of their descent, inversion, and fixed point multinomials. We
compute the spectrum and the multiplicities of its elements of that matrix.
Note that those multinomial statistics allow to apply the result on several
permutation statistics like the number of fixed points, of descents, of
inversions, and the major index at the same time.

18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat