Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Regular Polyhedra of Index Two, II   A polyhedron in Euclidean 3-space is called a regular polyhedron of index 2
if it is combinatorially regular and its geometric symmetry group has index 2
in its combinatorial automorphism group; thus its automorphism group is
flag-transitive but its symmetry group has two flag orbits. The present paper
completes the classification of finite regular polyhedra of index 2 in 3-space.
In particular, this paper enumerates the regular polyhedra of index 2 with
vertices on one orbit under the symmetry group. There are ten such polyhedra.

33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
1
The categories of this paper are: cs
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph