Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: N-Fold Cech Derived Functors and Generalised Hopf Type Formulas   In 1988, Brown and Ellis published [3] a generalised Hopf formula for the
higher homology of a group. Although substantially correct, their result lacks
one necessary condition. We give here a counterexample to the result without
that condition. The main aim of this paper is, however, to generalise this
corrected result to derive formulae of Hopf type for the n-fold Cech derived
functors of the lower central series functors Z_k. The paper ends with an
application to algebraic K-theory.

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The categories of this paper are: q-bio
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: cond-mat
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The categories of this paper are: solv-int
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The categories of this paper are: cs
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The categories of this paper are: nucl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: supr-con
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The categories of this paper are: hep-ex