Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Complex Hadamard matrices attached to a 3-class nonsymmetric association
  scheme   In this paper we classify complex Hadamard matrices contained in the
Bose-Mesner algebra of nonsymmetric 3-class association schemes. As a
consequence of our classification, we have two infinite families and some small
examples of complex Hadamard matrices contained in the Bose-Mesner algebra of a
self-dual fission of a complete multipartite graph.

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The categories of this paper are: hep-ex
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The categories of this paper are: q-bio
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The categories of this paper are: quant-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
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The categories of this paper are: acc-phys
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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: astro-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: nucl-ex
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: stat
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The categories of this paper are: nucl-th
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The categories of this paper are: gr-qc