Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Fractional Quantum Hall Effect   We give a brief introduction to the phenomenon of the Fractional Quantum Hall
effect, whose discovery was awarded the Nobel prize in 1998. We also explain
the composite fermion picture which describes the fractional quantum Hall
effect as the integer quantum Hall effect of composite fermions.

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The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
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The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
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The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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The categories of this paper are: stat
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The categories of this paper are: patt-sol
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The categories of this paper are: eess
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin