Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A non-reductive N=4 superconformal algebra   A new N=4 superconformal algebra (SCA) is presented. Its internal affine Lie
algebra is based on the seven-dimensional Lie algebra su(2)\oplus g, where g
should be identified with a four-dimensional non-reductive Lie algebra. Thus,
it is the first known example of what we choose to call a non-reductive SCA. It
contains a total of 16 generators and is obtained by a non-trivial
In\"on\"u-Wigner contraction of the well-known large N=4 SCA. The recently
discovered asymmetric N=4 SCA is a subalgebra of this new SCA. Finally, the
possible affine extensions of the non-reductive Lie algebra g are classified.
The two-form governing the extension appearing in the SCA differs from the
ordinary Cartan-Killing form.

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The categories of this paper are: hep-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: cond-mat
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The categories of this paper are: ao-sci
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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: cmp-lg
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The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: chem-ph
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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: physics