## Differential and Integral Equations

### The asymptotic behaviour of perturbed evolution families

#### Abstract

Given an evolution family $\mathcal U:={(U(t,s))_{t\geq s}}$ on a Banach space $X$, we present some conditions under which asymptotic properties of $\mathcal U$ are stable under small perturbations by a family $$\mathcal{B}:=(B(t),D(B(t))_{t\in\mathbb{J}},$$ $\mathbb{J} =\mathbb{R}$ or $\mathbb{R}_+$, of linear closed operators on $X$. Our results concern asymptotic properties like periodicity, (asymptotic) almost periodicity (even in the sense of Eberlein), uniform ergodicity and total uniform ergodicity. We present, moreover, an application of the abstract results to non-autonomous partial differential equations with delay.

#### Article information

Source
Differential Integral Equations, Volume 15, Number 5 (2002), 567-586.

Dates
First available in Project Euclid: 21 December 2012

Permanent link to this document
https://projecteuclid.org/euclid.die/1356060830

Mathematical Reviews number (MathSciNet)
MR1895896

Zentralblatt MATH identifier
1042.47031

#### Citation

Casarino, Valentina; Maniar, Lahcen; Piazzera, Susanna. The asymptotic behaviour of perturbed evolution families. Differential Integral Equations 15 (2002), no. 5, 567--586. https://projecteuclid.org/euclid.die/1356060830