Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Projectors and Local Operators in Lattice Integrable Models   In the framework of the quantum inverse scattering method, we consider a
problem of constructing local operators for two-dimensional quantum integrable
models, especially for the lattice versions of the nonlinear Schrodinger and
sine-Gordon models. We show that a certain class of local operators can be
constructed from the matrix elements of the monodromy matrix in a simple way.
They are closely related to the quantum projectors and have nice commutation
relations with the half of the matrix elements of the elementary monodromy
matrix. The form factors of these operators can be calculated by using the
standard algebraic Bethe ansatz techniques.

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The categories of this paper are: cmp-lg
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The categories of this paper are: bayes-an
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: stat
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The categories of this paper are: dg-ga
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The categories of this paper are: nlin
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The categories of this paper are: quant-ph
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The categories of this paper are: funct-an
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The categories of this paper are: q-fin
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The categories of this paper are: econ
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The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int
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The categories of this paper are: hep-lat
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The categories of this paper are: plasm-ph
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The categories of this paper are: mtrl-th