Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The moduli space of curves and its invariants   This note is about invariants of moduli spaces of curves. It includes their
intersection theory and cohomology. Our main focus in on the distinguished
piece containing the so called tautological classes. These are the most natural
classes on the moduli space. We give a review of known results and discuss
their conjectural descriptions.

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The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
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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: stat
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The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th