Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Limit Cycle Oscillations in Pacemaker Cells   In recent decades, several mathematical models describing the pacemaker
activity of the rabbit sinoatrial node have been developed. We demonstrate that
it is not possible to establish the existence, uniqueness, and stability of a
limit cycle oscillation in those models. Instead we observe an infinite number
of limit cycles. We then display numerical results from a new model, with a
limit cycle that can be reached from many different initial conditions.

13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs