# American Institute of Mathematical Sciences

September  2019, 8(3): 663-668. doi: 10.3934/eect.2019031

## Two questions arising in the theory of attractors

 Politecnico di Milano - Dipartimento di Matematica, Via Bonardi 9, 20133 Milano, Italy

Received  February 2019 Revised  May 2019 Published  September 2019 Early access  May 2019

In this note, we dwell on the notions of global and exponential attractors for strongly continuous semigroups acting on a complete metric space. Two natural questions arising in the theory are addressed.

Citation: Vittorino Pata. Two questions arising in the theory of attractors. Evolution Equations & Control Theory, 2019, 8 (3) : 663-668. doi: 10.3934/eect.2019031
##### References:
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##### References:
 [1] A. V. Babin and M. I. Vishik, Attractors of Evolution Equations, North-HollandAmsterdam, 1992.  Google Scholar [2] V. V. Chepyzhov and M. I. Vishik, Attractors for Equations of Mathematical Physics, Amer. Math. Soc. Providence, 2002.  Google Scholar [3] A. Eden, C. Foias, B. Nicolaenko and R. Temam, Exponential Attractors for Dissipative Evolution Equations, MassonParis, 1994.  Google Scholar [4] M. Efendiev, A. Miranville and S. Zelik, Exponential attractors for a nonlinear reaction-diffusion system in ${\mathbb R}^3$, C.R. Acad. Sci. Paris Sér. I Math., 330 (2000), 713-718.  doi: 10.1016/S0764-4442(00)00259-7.  Google Scholar [5] J. K. Hale, Asymptotic Behavior of Dissipative Systems, Amer. Math. Soc. Providence, 1988.  Google Scholar [6] A. Haraux, Systèmes Dynamiques Dissipatifs Et Applications, MassonParis, 1991.  Google Scholar [7] A. Miranville and S. Zelik, Attractors for dissipative partial differential equations in bounded and unbounded domains, Handbook of Differential Equations: Evolutionary Equations, Handb. Differ. Equ., Elsevier/North-Holland, Amsterdam, 4 (2008), 103–200. doi: 10.1016/S1874-5717(08)00003-0.  Google Scholar [8] A. Pazy, Semigroups of Linear Operators and Applications to Partial Differential Equations, Springer-Verlag, New York, 1983. doi: 10.1007/978-1-4612-5561-1.  Google Scholar [9] R. Temam, Infinite-dimensional Dynamical Systems in Mechanics and Physics, Springer, New York, 1997. doi: 10.1007/978-1-4612-0645-3.  Google Scholar
Trajectories of the semigroup S(t)
Portrait of the exponential attractor ε
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