# American Institute of Mathematical Sciences

doi: 10.3934/eect.2020086

## Solvability in abstract evolution equations with countable time delays in Banach spaces: Global Lipschitz perturbation

 Department of Mathematics, Tokyo University of Science, 1-3, Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan

* Corresponding author: Tomomi Yokota

Received  February 2020 Revised  June 2020 Published  August 2020

Fund Project: The first author is supported by Grant-in-Aid for Scientific Research (C), No. 16K05182

This paper deals with the solvability in the semilinear abstract evolution equation with countable time delays,
 $\begin{equation*} \begin{cases} \dfrac{du}{dt}(t)+Au(t) = F(u(t), (u(t-\tau_n))_{n\in\mathbb{N}}), & t>0, \\ u(t) = u_0(t), & t \in \bigcup\limits_{n \in \mathbb{N}}[-\tau_n,0], \end{cases} \end{equation*}$
in a Banach space
 $X$
, where
 $-A$
is a generator of a
 $C_0$
-semigroup with exponential decay and
 $F: X \times X^\mathbb{N} \to X$
is Lipschitz continuous. Nicaise and Pignotti (J. Evol. Equ.; 2018;18;947–971) established global existence and exponential decay in time for solutions of the above equation with finite time delays in Hilbert spaces under global or local Lipschitz conditions. The purpose of the present paper is to generalize the result to the case of countable time delays in Banach spaces under a global Lipschitz condition.
Citation: Tomomi Yokota, Kentarou Yoshii. Solvability in abstract evolution equations with countable time delays in Banach spaces: Global Lipschitz perturbation. Evolution Equations & Control Theory, doi: 10.3934/eect.2020086
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