Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two- and Three-dimensional Generalisation of Lower Order Local Wave
  Velocities   A general local approach for the definition of velocities and especially
phase velocities for waves recently proposed for one-dimensional waves is
generalized for 2 and 3 dimensional scalar wave. A geometrically consistent
generalization has been found for the local wave velocities of order zero and
one.

19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom