Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The volume formulas for a spherical tetrahedron   The present paper gives two concrete formulas for the volume of an arbitrary
spherical tetrahedron, which is in a 3-dimensional spherical space of constant
curvature +1. One formula is given in terms of dihedral angles, and another one
is given in terms of edge lengths.

31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
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