# American Institute of Mathematical Sciences

August  2013, 33(8): 3567-3582. doi: 10.3934/dcds.2013.33.3567

## Explicit upper and lower bounds for the traveling wave solutions of Fisher-Kolmogorov type equations

 1 Dept. de Matemàtiques, Universitat Autònoma de Barcelona, Edifici C, 08193 Bellaterra, Barcelona 2 Laboratoire de Mathématique et Physique Théorique, C.N.R.S. UMR 7350, Faculté des Sciences et Techniques, Université de Tours, Parc de Grandmont,37200 Tours 3 Departament de Matemàtiques, Universitat Autònoma de Barcelona, Edifici C, 08193 Bellaterra, Barcelona, Spain

Received  July 2012 Revised  November 2012 Published  January 2013

It is well-known that the existence of traveling wave solutions for reaction-diffusion partial differential equations can be proved by showing the existence of certain heteroclinic orbits for related autonomous planar differential equations. We introduce a method for finding explicit upper and lower bounds of these heteroclinic orbits. In particular, for the classical Fisher-Kolmogorov equation we give rational upper and lower bounds which allow to locate these solutions analytically and with very high accuracy. These results allow one to construct analytical approximate expressions for the traveling wave solutions with a rigorous control of the errors for arbitrary values of the independent variables. These explicit expressions are very simple and tractable for practical purposes. They are constructed with exponential and rational functions.
Citation: Armengol Gasull, Hector Giacomini, Joan Torregrosa. Explicit upper and lower bounds for the traveling wave solutions of Fisher-Kolmogorov type equations. Discrete & Continuous Dynamical Systems - A, 2013, 33 (8) : 3567-3582. doi: 10.3934/dcds.2013.33.3567
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##### References:
 [1] M. J. Ablowitz and A. Zeppetella, Explicit solutions of Fisher's equation for a special wave speed,, Bull. Math. Biol., 41 (1979), 835.  doi: 10.1016/S0092-8240(79)80020-8.  Google Scholar [2] D. G. Aronson and H. F. Weinberger, "Nonlinear Diffusion in Population Genetics, Combustion, and Nerve Pulse Propagation,", Partial Differential Equations and Related Topics (Program, 446 (1974), 5.   Google Scholar [3] R. A. Fisher, The wave of advance of advantageous genes,, Ann. Eugenics, 7 (1937), 355.   Google Scholar [4] A. Gasull, H. Giacomini and J. Torregrosa, Some results on homoclinic and heteroclinic connections in planar systems,, Nonlinearity, 23 (2010), 2977.  doi: 10.1088/0951-7715/23/12/001.  Google Scholar [5] A. Goriely, A simple solution to the nonlinear front problem,, Phys. Rev. Lett., 75 (1995), 2047.   Google Scholar [6] P. Grindrod, Patterns and Waves, "The Theory and Applications of Reaction-Diffusion Equations,", Clarendon Press, (1991).   Google Scholar [7] A. Kolmogorov, I. Petrovskii and N. Piskunov, A study of the diffusion equation with increase in the amount of substance, and its application to a biological problem,, in, 1 (1937), 248.   Google Scholar [8] A. C. Newell and J. A. Whitehead, Finite bandwidth, finite amplitude convection,, J. Fluid Mech., 38 (1969), 279.   Google Scholar [9] M. R. Rodrigo and R. M. Miura, Exact and approximate traveling waves of reaction-diffusion systems via a variational approach,, Anal. Appl. (Singap.), 9 (2011), 187.  doi: 10.1142/S0219530511001807.  Google Scholar [10] F. Sánchez-Garduño and P. K. Maini, Travelling wave phenomena in some degenerate reaction-diffusion equations,, J. Differential Equations, 117 (1995), 281.  doi: 10.1006/jdeq.1995.1055.  Google Scholar [11] F. Sánchez-Garduño and P. K. Maini, Travelling wave phenomena in non-linear diffusion degenerate Nagumo equations,, J. Math. Biol., 35 (1997), 713.  doi: 10.1007/s002850050073.  Google Scholar [12] L. A. Segel, Distant sidewalls cause slow amplitude modulation of cellular convection,, J. Fluid Mech., 38 (1969), 203.   Google Scholar [13] J. Xin, Front propagation in heterogeneous media,, SIAM Rev., 42 (2000), 161.  doi: 10.1137/S0036144599364296.  Google Scholar [14] Y. B. Zeldovich and D. A. Frank-Kamenetskii, A theory of thermal propagation of flame,, Acta Physicochimica URSS 9 (1938), 9 (1938), 341.   Google Scholar
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