Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Congruence relations for Shimura varieties associated to some unitary
  groups   In this paper we study the reduction of PEL-Shimura varieties associated to
unitary groups of signature (n-1,1) in the inert and unramified case. We
describe the Newton polygon and the Ekedahl-Oort stratification. We further
study the associated moduli space of isogenies and use a variant of the local
model to give a generic description. As an application we prove a conjecture of
Blasius und Rogawski about the congruence relation if the integer n is even.

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The categories of this paper are: hep-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
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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: hep-th
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The categories of this paper are: q-fin
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The categories of this paper are: ao-sci
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The categories of this paper are: eess
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The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
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The categories of this paper are: nlin
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The categories of this paper are: dg-ga