Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Orthogonal exceptional collections from $\mathbb{Q}$-Gorenstein
  degeneration of surfaces   We consider a surface that admits a $\mathbb{Q}$-Gorenstein degeneration to a
cyclic quotient singularity $\frac{1}{dn^2}(1,dna-1)$. Under several technical
assumptions, we construct $d$ exceptional vector bundles of rank $n$ which are
orthogonal to each other.

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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: nlin
35
The categories of this paper are: mtrl-th
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The categories of this paper are: physics
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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The categories of this paper are: stat
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-alg
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org
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The categories of this paper are: q-bio
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The categories of this paper are: gr-qc
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The categories of this paper are: q-fin
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The categories of this paper are: hep-lat