Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Time-Ordered Products and Exponentials   I discuss a formula decomposing the integral of time-ordered products of
operators into sums of products of integrals of time-ordered commutators. The
resulting factorization enables summation of an infinite series to be carried
out to yield an explicit formula for the time-ordered exponentials. The
Campbell-Baker-Hausdorff formula and the nonabelian eikonal formula obtained
previously are both special cases of this result.

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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys
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The categories of this paper are: adap-org
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The categories of this paper are: math-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: cs
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The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom
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The categories of this paper are: physics
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The categories of this paper are: chem-ph