Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enumeration of alternating sign matrices of even size (quasi-)nvariant
  under a quarter-turn rotation   The aim of this work is to enumerate alternating sign matrices (ASM) that are
quasi-invariant under a quarter-turn. The enumeration formula (conjectured by
Duchon) involves, as a product of three terms, the number of unrestricted ASM's
and the number of half-turn symmetric ASM's.

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The categories of this paper are: gr-qc
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The categories of this paper are: hep-lat
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The categories of this paper are: q-bio
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The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin
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The categories of this paper are: quant-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: mtrl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: astro-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom