Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Small Polyhedral Z-Acyclic 2-Complex in R4   We present a small 4-dimensional polyhedral realization of a 2-dimensional
Z-acyclic but non-contractible simplicial complex.

19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph