Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-radial solutions of the problem $-\Delta u = |u|^{4/(n-2)}u$ in
  $R^n$, $n\geq3$   We prove the existence of an infinite sequence of distinct non-radial nodal
$G-$invariant solutions for the following critical nonlinear elliptic problem:
$({\mathrm{P}})\quad {*{20}c} {-\Delta u = |u|^{4/(n-2)}u},\quad u\in
C^2(\mathbb{R}^n), \quad n\geq3}$

29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph