Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Construction of Some Generalised Modular Symbols   We give a criterion for the non-vanishing of some generalised modular
symbols. The criterion is in terms of the non-vanishing of some classes on the
compact dual of the locally symmetric manifold. As an application, we construct
non-zero modular symbols on SL(2n) over an imaginary quadratic extension of
$\Q$, which turn out to be ghost classes.

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The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-th
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The categories of this paper are: hep-lat
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: gr-qc
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The categories of this paper are: supr-con
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: acc-phys
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The categories of this paper are: mtrl-th