Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum permutations, Hadamard matrices, and the search for matrix
  models   This is a presentation of recent work on quantum permutation groups, complex
Hadamard matrices, and the connections between them. A long list of problems is
included. We include as well some conjectural statements, about matrix models.

25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
19
The categories of this paper are: eess
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th