Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Calculating Four-Loop Corrections in QCD   We review the current status of perturbative corrections in QCD at four loops
for scattering processes with space- and time-like kinematics at colliders,
with specific focus on deep-inelastic scattering and electron-positron
annihilation. The calculations build on the parametric reduction of loop and
phase space integrals up to four-loop order using computer algebra programs
such as FORM, designed for large scale computations.

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The categories of this paper are: plasm-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: quant-ph
3
The categories of this paper are: physics
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The categories of this paper are: math-ph
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The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: astro-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: bayes-an
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The categories of this paper are: q-fin
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The categories of this paper are: ao-sci
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The categories of this paper are: q-bio