Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamical generalizations of the Drake equation: the linear and
  non-linear theories   The Drake equation pertains to the essentially equilibrium situation in a
population of communicative civilizations (CCs) of the Galaxy, but it does not
describe dynamical processes which can occur in it. Both linear and non-linear
dynamical population analysis is build out and discussed instead of the Drake
equation.

30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th