Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two Generalizations of $\eta$ Pairing in Extended Hubbard Models   A rigorous result about Hubbard model obtained by C.N.Yang
[Phys.Rev.Lett.63,2144(1989)] is generalized to two kinds of extended Hubbard
models. One is the Hubbard model in two-dimensional triangular lattice, and the
other is the Hubbard model for high spins fermions. We obtain the conditions
under which a modified $\eta$-pairing operator is an eigen-operator, thus these
models have a series of eigenstates possessing off-diagonal long-range order.

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The categories of this paper are: gr-qc
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The categories of this paper are: mtrl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-th
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The categories of this paper are: math
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The categories of this paper are: hep-ph
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The categories of this paper are: solv-int
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The categories of this paper are: cmp-lg
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The categories of this paper are: math-ph
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The categories of this paper are: adap-org
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The categories of this paper are: physics
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The categories of this paper are: q-bio
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The categories of this paper are: q-alg
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom