Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Embedding simply connected 2-complexes in 3-space -- II. Rotation
  systems   We prove that 2-dimensional simplicial complexes whose first homology group
is trivial have topological embeddings in 3-space if and only if there are
embeddings of their link graphs in the plane that are compatible at the edges
and they are simply connected.

19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
9
The categories of this paper are: nlin