# American Institute of Mathematical Sciences

December  2012, 32(12): 4111-4131. doi: 10.3934/dcds.2012.32.4111

## Noninvertible cocycles: Robustness of exponential dichotomies

 1 Departamento de Matemática, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa 2 Departamento de Matemática, Instituto Superior Técnico, 1049-001 Lisboa

Received  June 2010 Revised  May 2012 Published  August 2012

For the dynamics defined by a sequence of bounded linear operators in a Banach space, we establish the robustness of the notion of exponential dichotomy. This means that an exponential dichotomy persists under sufficiently small linear perturbations. We consider the general cases of a nonuniform exponential dichotomy, which requires much less than a uniform exponential dichotomy, and of a noninvertible dynamics or, more precisely, of a dynamics that may not be invertible in the stable direction.
Citation: Luis Barreira, Claudia Valls. Noninvertible cocycles: Robustness of exponential dichotomies. Discrete & Continuous Dynamical Systems, 2012, 32 (12) : 4111-4131. doi: 10.3934/dcds.2012.32.4111
##### References:
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##### References:
 [1] L. Barreira and Ya. Pesin, "Nonuniform Hyperbolicity," Encyclopedia of Math. and Its Appl. 115, Cambridge Univ. Press, 2007.  Google Scholar [2] L. Barreira and C. Valls, Stability theory and Lyapunov regularity, J. Differential Equations, 232 (2007), 675-701. doi: 10.1016/j.jde.2006.09.021.  Google Scholar [3] L. Barreira and C. Valls, Robustness of nonuniform exponential dichotomies in Banach spaces, J. Differential Equations, 244 (2008), 2407-2447. doi: 10.1016/j.jde.2008.02.028.  Google Scholar [4] L. Barreira and C. Valls, "Stability of Nonautonomous Differential Equations," Lect. Notes in Math. 1926, Springer, 2008.  Google Scholar [5] L. Barreira and C. Valls, Robustness of discrete dynamics via Lyapunov sequences, Comm. Math. Phys., 290 (2009), 219-238. doi: 10.1007/s00220-009-0762-z.  Google Scholar [6] L. Barreira and C. Valls, Robust nonuniform dichotomies and parameter dependence, J. Math. Anal. Appl., 373 (2011), 690-708. doi: 10.1016/j.jmaa.2010.08.026.  Google Scholar [7] C. Chicone and Yu. Latushkin, "Evolution Semigroups in Dynamical Systems and Differential Equations," Mathematical Surveys and Monographs 70, Amer. Math. Soc., 1999.  Google Scholar [8] S.-N. Chow and H. Leiva, Existence and roughness of the exponential dichotomy for skew-product semiflow in Banach spaces, J. Differential Equations, 120 (1995), 429-477. doi: 10.1006/jdeq.1995.1117.  Google Scholar [9] W. Coppel, Dichotomies and reducibility, J. Differential Equations, 3 (1967), 500-521.  Google Scholar [10] W. Coppel, "Dichotomies in Stability Theory," Lect. Notes in Math. 629, Springer, 1978.  Google Scholar [11] Ju. Dalec$'$kiĭ and M. Kreĭn, "Stability of Solutions of Differential Equations in Banach Space," Translations of Mathematical Monographs 43, Amer. Math. Soc., 1974.  Google Scholar [12] J. Hale, "Asymptotic Behavior of Dissipative Systems," Mathematical Surveys and Monographs 25, Amer. Math. Soc., 1988.  Google Scholar [13] D. Henry, "Geometric Theory of Semilinear Parabolic Equations," Lect. Notes in Math. 840, Springer, 1981.  Google Scholar [14] N. Huy, Exponential dichotomy of evolution equations and admissibility of function spaces on a half-line, J. Funct. Anal., 235 (2006), 330-354. doi: 10.1016/j.jfa.2005.11.002.  Google Scholar [15] J. Massera and J. Schäffer, Linear differential equations and functional analysis. I, Ann. of Math., 67 (1958), 517-573. doi: 10.2307/1969871.  Google Scholar [16] J. Massera and J. Schäffer, "Linear Differential Equations and Function Spaces," Pure and Applied Mathematics, 21, Academic Press, 1966.  Google Scholar [17] R. Naulin and M. Pinto, Stability of discrete dichotomies for linear difference systems, J. Differ. Equations Appl., 3 (1997), 101-123.  Google Scholar [18] R. Naulin and M. Pinto, Admissible perturbations of exponential dichotomy roughness, Nonlinear Anal., 31 (1998), 559-571. doi: 10.1016/S0362-546X(97)00423-9.  Google Scholar [19] O. Perron, Die Stabilit\"atsfrage bei Differentialgleichungen, Math. Z., 32 (1930), 703-728. doi: 10.1007/BF01194662.  Google Scholar [20] V. Pliss and G. Sell, Robustness of exponential dichotomies ininfinite-dimensional dynamical systems, J. Dynam. Differential Equations, 11 (1999), 471-513. doi: 10.1023/A:1021913903923.  Google Scholar [21] L. Popescu, Exponential dichotomy roughness on Banach spaces, J. Math. Anal. Appl., 314 (2006), 436-454. doi: 10.1016/j.jmaa.2005.04.011.  Google Scholar [22] A. Sasu, Exponential dichotomy and dichotomy radius for difference equations, J. Math. Anal. Appl., 344 (2008), 906-920. doi: 10.1016/j.jmaa.2008.03.019.  Google Scholar [23] B. Sasu and A. Sasu, Input-output conditions for the asymptotic behavior of linear skew-product flows and applications, Commun. Pure Appl. Anal., 5 (2006), 551-569.  Google Scholar [24] G. Sell and Y. You, "Dynamics of Evolutionary Equations," Applied Mathematical Sciences 143, Springer, 2002.  Google Scholar
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