Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strong-interaction approximation for transfer matrix method   Using transfer-matrix method a correspondence between $2D$ classical spin
systems ($2D$ Ising model and six-vertex model) and $1D$ quantum spin systems
is considered. We find the transfer matrix in two limits - in a well-known
strong-anisotropy limit and a novel strong-interaction limit. In contrast to
the usual strong-anisotropy approximation, within the strong-interaction
approximation we take into account the non-commutativity of transfer-matrix
components. The latter approximation is valid for low temperatures or strong
interaction in one spatial dimension. We observe that the Hamiltonian of the
corresponding quantum chains contains multispin interactions.

13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom