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A survey on new methods for partial functional differential equations and applications

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Abstract

This work is a survey of many papers dealing with new methods to study partial functional differential equations. We propose a new reduction method of the complexity of partial functional differential equations and its applications. Since, any partial functional differential equation is well-posed in a infinite dimensional space, this presents many difficulties to study the qualitative analysis of the solutions. Here, we propose to reduce the dimension from infinite to finite. We suppose that the undelayed part is not necessarily densely defined and satisfies the Hille–Yosida condition. The delayed part is continuous. We prove the dynamic of solutions are obtained through an ordinary differential equations that is well-posed in a finite dimensional space. The powerty of this results is used to show the existence of almost automorphic solutions for partial functional differential equations. For illustration, we provide an application to the Lotka–Volterra model with diffusion and delay.

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Acknowledgements

The author would like to thank Professor Ovide Arino from whom he has learnt a lot about about the theory of partial functional differential equations and its application. This work is dedicated to his memory.

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  1. Department of Mathematics, Faculty of Sciences Semlalia, Cadi Ayyad University, B.P. 2390, Marrakech, Morocco

    Khalil Ezzinbi

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  1. Khalil Ezzinbi
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Correspondence to Khalil Ezzinbi.

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Ezzinbi, K. A survey on new methods for partial functional differential equations and applications. Afr. Mat. 31, 89–113 (2020). https://doi.org/10.1007/s13370-019-00731-x

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