Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New Developments in the Eight Vertex Model   We demonstrate that the Q matrix introduced in Baxter's 1972 solution of the
eight vertex model has some eigenvectors which are not eigenvectors of the spin
reflection operator and conjecture a new functional equation for Q(v) which
both contains the Bethe equation that gives the eigenvalues of the transfer
matrix and computes the degeneracies of these eigenvalues.

21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph