# American Institute of Mathematical Sciences

December  2010, 3(4): 667-682. doi: 10.3934/dcdss.2010.3.667

## Finite smooth normal forms and integrability of local families of vector fields

 1 Department of Mathematical Sciences, Florida Atlantic University, 777 Glades Road, 33431 Boca Raton, United States 2 School of Mathematical Sciences, Peking University, Beijing, 100871, China

Received  March 2009 Revised  May 2010 Published  August 2010

In this paper we study a class of smooth vector fields which depend on small parameters and their eigenvalues may admit certain resonances. We shall derive the polynomial normal forms for such systems under $C^k$ conjugacy, where $k$ can be arbitrarily large. When the smoothness of normalization is less required, we can even reduce these systems to their quasi-linearizable normal forms under $C^{k_0}$ conjugacy, where $k_0$ is good enough to preserve certain qualitative properties of the original systems while the normal forms are as convenient as the linearized ones in applications. Concerning the normalization procedure, we prove that the transformation can be expressed in terms of Logarithmic Mourtada Type (LMT) functions, which makes both qualitative and quantitative analysis possible.
Citation: Vincent Naudot, Jiazhong Yang. Finite smooth normal forms and integrability of local families of vector fields. Discrete & Continuous Dynamical Systems - S, 2010, 3 (4) : 667-682. doi: 10.3934/dcdss.2010.3.667
##### References:
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##### References:
 [1] V. I. Arnold and Yu. S. Ilyashenko, Ordinary differential equations,, Encyclopaedia of Math. Sci. 1, 1 (1988), 1.   Google Scholar [2] P. Bonckaert, V. Naudot and J. Yang, Linearization of germs of hyperbolic vector fields,, C. R. Math. Acad. Sci. Paris, 336 (2003), 19.   Google Scholar [3] I. U. Bronstein and A. Ya. Kopanskii, "Smooth Invariant Manifolds and Normal Forms,", World Scientific, (1994).  doi: 10.1142/9789812798749.  Google Scholar [4] A. D. Bruno, "Local Methods in Nonlinear Differential Equations,", Springer-Verlag, (1989).   Google Scholar [5] K.-T. Chen, Equivalence and decomposition of vector fields about an elementary critical point,, Amer. J. Math., 85 (1963), 693.  doi: 10.2307/2373115.  Google Scholar [6] Yu. S. Ilyashenko and S. Yu. Yakovenko, Finitely smooth normal forms of local families of diffeomorphisms and vector fields,, Russian Math. Surveys, 46 (1991), 1.  doi: 10.1070/RM1991v046n01ABEH002733.  Google Scholar [7] M. Martens, V. Naudot and J. Yang, A strange attractor with large entropy in the unfodling of a low resonant degenerate homoclinic orbit,, Intern. Journ. of Bifurcation & Chaos, 16 (2006), 3509.  doi: 10.1142/S0218127406016951.  Google Scholar [8] V. Naudot, Strange attractor in the unfolding of an inclination-flip homoclinic orbit,, Ergodic Theory and Dynamical Systems, 16 (1996), 1071.   Google Scholar [9] V. Naudot and J. Yang, Linearization of families of germs of hyperbolic vector fields,, Dynamical Systems, 23 (2008), 467.  doi: 10.1080/14689360802331162.  Google Scholar [10] V. S. Samovol, Linearization of systems of differential equations in a neighbourhood of invariant toroidal manifolds,, Proc. Moscow Math. Soc., 38 (1979), 187.   Google Scholar [11] V. S. Samovol, A necessary and sufficient condition of smooth linearization of an autonomous planar system in a neighborhood of a critical point,, Math. Notes, 46 (1989), 543.  doi: 10.1007/BF01159105.  Google Scholar [12] S. Sternberg, On the structure of local homeomorphisms of Euclidean $n$-space, II,, Amer. J. Math., 80 (1958), 623.  doi: 10.2307/2372774.  Google Scholar [13] S. Sternberg, The structure of local homeomorphisms, III,, Amer. J. Math., 81 (1959), 578.  doi: 10.2307/2372915.  Google Scholar [14] J. Yang, Polynomial normal forms for vector fields on $R^3$,, Duke Math. J., 106 (2001), 1.  doi: 10.1215/S0012-7094-01-10611-X.  Google Scholar
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