Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Ponzano-Regge asymptotic of the 6j symbol: an elementary proof   In this paper we give a direct proof of the Ponzano-Regge asymptotic formula
for the Wigner 6j symbol starting from Racah's single sum formula. Our method
treats halfinteger and integer spins on the same footing. The generalization to
Minkowskian tetrahedra is direct. This result should be relevant for the
introduction of renormalization scales in spin foam models.

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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: eess
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The categories of this paper are: bayes-an
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The categories of this paper are: supr-con
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The categories of this paper are: stat
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: mtrl-th
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The categories of this paper are: cs
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The categories of this paper are: q-bio
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The categories of this paper are: q-fin