Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Pion Electroproduction in the $\Delta$(1232) region region   The amplitudes of the pion electroproduction from the nucleon are derived up
to third order in the chiral effective theory including explicit $\Delta$(1232)
>. The Q^2 evolutions of weighted integrals of amplitudes are presented.

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The categories of this paper are: physics
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-th
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The categories of this paper are: chem-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: stat
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The categories of this paper are: eess
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The categories of this paper are: dg-ga
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The categories of this paper are: q-alg
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The categories of this paper are: math-ph
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The categories of this paper are: solv-int
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The categories of this paper are: plasm-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: cs
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The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol