Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multiplicative integrable models from Poisson-Nijenhuis structures   We discuss the role of Poisson-Nijenhuis geometry in the definition of
multiplicative integrable models on symplectic groupoids. These are integrable
models that are compatible with the groupoid structure in such a way that the
set of contour levels of the hamiltonians in involution inherits a topological
groupoid structure. We show that every maximal rank PN structure defines such a
model. We consider the examples defined on compact hermitian symmetric spaces
and studied in [arXiv:1503.07339].

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The categories of this paper are: gr-qc
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The categories of this paper are: q-alg
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The categories of this paper are: econ
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The categories of this paper are: cond-mat
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-bio
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ph
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The categories of this paper are: adap-org
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The categories of this paper are: acc-phys
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The categories of this paper are: comp-gas
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-lat
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The categories of this paper are: astro-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: chao-dyn