Abstract
The introduction of concepts of Game Theory and Ordinary Differential Equations into Biology gave birth to the field of Evolutionary Stable Strategies, with applications in Biology, Genetics, Politics, Economics and others. In special, the model composed by two players having two pure strategies each results in a planar cubic vector field with an invariant octothorpe. Therefore, in this paper we study such class of vector fields, suggesting the notion of genericity and providing the global phase portraits of the generic systems with a singularity at the central region of the octothorpe.
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Acknowledgements
The authors are grateful to professor Armengol Gasull for sharing the idea of applying the tools of Dynamic Systems to study the models of Evolutionary Stable Strategies.
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The authors are partially supported by CNPq, Grant 304798/2019-3 and by São Paulo Research Foundation (FAPESP), Grants 2019/10269-3 and 2021/01799-9.
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Appendices
Appendix A: Phase portraits under the hypothesis of Theorem 10 (Family 2)
To simplify Table 6, we denote \(\Delta =(b_{10}-a_{01})^2+4b_{01}\) (Figs. 19, 20 and 21).
Appendix B: Phase portraits under the hypothesis of Theorem 11 (Family 3)
Appendix C: Phase portraits under the hypothesis of Theorem 12 (Family 4)
To simplify the Table 8, we denote (Figs. 23, 24 and 25),
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Bastos, J., Buzzi, C. & Santana, P. Evolutionary stable strategies and cubic vector fields. Nonlinear Differ. Equ. Appl. 31, 13 (2024). https://doi.org/10.1007/s00030-023-00894-4
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DOI: https://doi.org/10.1007/s00030-023-00894-4