## Differential and Integral Equations

- Differential Integral Equations
- Volume 9, Number 6 (1996), 1225-1252.

### Almost periodicity and stability for solutions to functional-differential equations with infinite delay

Wolfgang M. Ruess and William H. Summers

#### Abstract

We develop results on (a) almost periodicity properties and (b) (exponential) asymptotic stability of solutions to the functional differential equations with infinite delay (FDE) $ \dot{x}(t) + \alpha x(t) + Bx(t) \ni F(x_t) , $ $ t \geq 0,$ $x |_{\mathbb{R}^-} = \varphi \in E $ in a context which allows for a (generally) nonlinear and multivalued accretive state-responsive operator $ B \subset X \times X $ in a Banach state space $ X $ and a locally defined and locally Lipschitz continuous history-responsive function $ F : D(F) \subset E \to X, $ in an appropriate initial history space $ E $ of continuous functions from $ \mathbb{R}^- $ into $ X. $ Applications to models from population dynamics (delay logistic equation) and biology (Goodwin oscillator) are presented.

#### Article information

**Source**

Differential Integral Equations, Volume 9, Number 6 (1996), 1225-1252.

**Dates**

First available in Project Euclid: 6 May 2013

**Permanent link to this document**

https://projecteuclid.org/euclid.die/1367846898

**Mathematical Reviews number (MathSciNet)**

MR1409925

**Zentralblatt MATH identifier**

0879.34073

**Subjects**

Primary: 34K30: Equations in abstract spaces [See also 34Gxx, 35R09, 35R10, 47Jxx]

#### Citation

Ruess, Wolfgang M.; Summers, William H. Almost periodicity and stability for solutions to functional-differential equations with infinite delay. Differential Integral Equations 9 (1996), no. 6, 1225--1252. https://projecteuclid.org/euclid.die/1367846898