Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direction control of bilinear systems. I   We consider the general bilinear control systems in three-dimensional
Euclidean space which satisfy the LARC and have an open control set U; and give
sufficient controllability conditions for corresponding projected systems on
two-dimensional sphere.

29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int