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JOURNALS // Izvestiya Vysshikh Uchebnykh Zavedenii. Matematika // Archive

Izv. Vyssh. Uchebn. Zaved. Mat., 2026 Number 1, Pages 40–51 (Mi ivm10147)

Periodic solutions of a class of neutral non-autonomous partial differential equations in fading memory spaces

I. Oumadane, M. Zitane

Moulay Ismail University, Meknes, Morocco

Abstract: The present work deals with the existence and periodicity of solutions to non-autonomous partial differential equations of retarded, infinite, and neutral type in the framework of fading memory space, which is defined axiomatically. In our strategy, we rely on Sadovskii's fixed-point theorem. On the other hand, the family of linear operators $A(\cdot)$ is assumed to be non-densely defined and verified by the Acquistapace–Terreni conditions. Finally, we propose an application to illustrate our results.

Keywords: infinite delay equation, periodic solution, Sadovskii's fixed point theorem, Kuratowski's measure, neutral equation.

UDC: 517

Received: 18.07.2024
Revised: 19.06.2025
Accepted: 26.09.2025

DOI: 10.26907/0021-3446-2026-1-40-51



© Steklov Math. Inst. of RAS, 2026