Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A note on De Concini and Procesi's curious identity   We give a short, case-free and combinatorial proof of de Concini and
Procesi's formula for the volume of the simplicial cone spanned by the simple
roots of any finite root system. The argument presented here also extends their
formula to include the non-crystallographic root systems.

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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
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The categories of this paper are: nucl-th
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The categories of this paper are: mtrl-th
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn
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The categories of this paper are: quant-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: q-bio
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The categories of this paper are: funct-an
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The categories of this paper are: q-fin
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The categories of this paper are: comp-gas