Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the geometric structures in evolutionary games on square and
  triangular lattices   We study a model of a spatial evolutionary game, based on the Prisoner's
dilemma for two regular arrangements of players, on a square lattice and on a
triangular lattice. We analyze steady state distributions of players which
evolve from irregular, random initial configurations. We find significant
differences between the square and triangular lattice, and we characterize the
geometric structures which emerge on the triangular lattice.

21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin