Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Complex Spinors and Unified Theories   In this paper delivered by Murray Gell-Mann at the Stony Brook Supergravity
Workshop in 1979, several paths to unification are discussed, from N=8
supergravity to $SU_5$, $SO_{10}$, and $E_6$. Generalizations of $SO_{10}$ to
spinor representations of larger groups are introduced. A natural mechanism for
generating tiny neutrino masses is proposed in the context of $SO_{10}$, and
finally, focus on $SU_3$ rather than $SU_2$ or $SO_3$ family symmetries is
noted.

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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-th
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The categories of this paper are: supr-con
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The categories of this paper are: solv-int
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The categories of this paper are: q-alg
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The categories of this paper are: mtrl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
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The categories of this paper are: physics
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The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: nlin
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The categories of this paper are: comp-gas