Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Time Reversal of the Increasing Geometrical Progression of the
  Population of a Simple Biological Specie   In this work we consider time reversal of the increasing geometrical
progression of the population of a simple biological species without any
enemies (predators) in the appropriate environment with unlimited resources
(food, territory, etc.). It is shown that such time reversal corresponds to
appearance of the cannibalism, i.e. self-predaciousness or self-damping
phenomena which can be described by a type of difference Verhulst equation.

16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg