## Asymptotic behaviour and dynamics in infinite dimensions.(English)Zbl 0653.35006

Nonlinear differential equations, Lect. 7th Congr., Granada/Spain 1984, Res. Notes Math. 132, 1-42 (1985).
[For the entire collection see Zbl 0638.00015.]
Let T(t) (t$$\geq 0)$$ be a $$C^ r$$-semigroup on a Banach space. In this paper several conceptions, such as positive orbit $$\gamma^+(x)$$, negative orbit $$\gamma^-(x)$$, $$\omega$$-limit set $$\omega$$ (x) of $$x\in X$$, $$\alpha$$-limit set $$\alpha$$ (x), global orbit, invariant set, and attractor, are defined. Then some conditions are imposed on T(t) to ensure that there is a compact attractor A and the stability properties of an attractor A are discussed. Considerable attention is also devoted to gradient systems, existence conditions for a compact attractor and the flow on the attractor. Finally, the dynamics of scalar parabolic equations are studied.
Reviewer: J.H.Tian

### MSC:

 35B40 Asymptotic behavior of solutions to PDEs 37C70 Attractors and repellers of smooth dynamical systems and their topological structure 35B35 Stability in context of PDEs 37C80 Symmetries, equivariant dynamical systems (MSC2010) 37D15 Morse-Smale systems 37C75 Stability theory for smooth dynamical systems

Zbl 0638.00015