Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On The Acyclic MacPhersonian   In 2003 Daniel K. Biss published, in the Annals of Mathematics, what he
thought was a solution of a long standing problem culminating a discovery by
Gelfand and MacPherson. Six years later he was encouraged to publish an
"erratum" of his prove, observed by Nikolai Mnev; up to now, the homotopy type
of the MacPhersonian had remained a mistery... The aim of this lecture is to
convince the attendee of the fact that, using a compleatly different aproach to
those used before, we can prove that the acyclic MacPhersonian has the homotopy
type of the affine Grassmannian.

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The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
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The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
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The categories of this paper are: eess
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The categories of this paper are: comp-gas
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The categories of this paper are: nucl-ex
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The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn