Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Gross-Kohnen-Zagier type formula for moduli of shtukas with Iwahori
  level structures   In this paper I'm going to study the intersection of two Heegner-Drinfeld
cycles coming from two different nonsplit tori on the Yun-Zhang moduli stack of
$PGL_2$ Drinfeld stukas with Iwahori level structure. We will see that the
intersection number is related to a certain period integral. It is an extension
of the result by Howard-Shinidman to the Iwahori case.

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The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
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The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
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The categories of this paper are: nlin
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The categories of this paper are: quant-ph
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The categories of this paper are: q-alg
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The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
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The categories of this paper are: alg-geom
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The categories of this paper are: chao-dyn
3
The categories of this paper are: physics