Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strange Attractor in Immunology of Tumor Growth   The time delayed cytotoxic T-lymphocyte response on the tumor growth has been
developed on the basis of discrete approximation (2-dimensional map). The
growth kinetic has been described by logistic law with growth rate being the
bifurcation parameter. Increase in the growth rate results in instability of
the tumor state and causes period-doubling bifurcations in the immune+tumor
system. For larger values of tumor growth rate a strange attractor has been
observed. The model proposed is able to describe the metastable-state
production when time series data of the immune state and the number of tumor
cells are irregular and unpredictable. This metastatic disease may be caused
not by exterior (medical) factors, but interior density dependent ones.

28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
29
The categories of this paper are: funct-an