Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On biquaternion algebras with involution of orthogonal type   We investigate the pfaffians of decomposable biquaternion algebras with
involution of orthogonal type. In characteristic two, a classification of these
algebras in terms of their pfaffians and some other related invariants is
studied. Also, in arbitrary characteristic, a criterion is obtained for an
orthogonal involution on a biquaternion algebra to be metabolic.

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The categories of this paper are: gr-qc
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The categories of this paper are: eess
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The categories of this paper are: comp-gas
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The categories of this paper are: q-bio
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The categories of this paper are: patt-sol
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The categories of this paper are: chem-ph
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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: physics
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The categories of this paper are: hep-th
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The categories of this paper are: ao-sci
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The categories of this paper are: astro-ph
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The categories of this paper are: econ
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The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom