**Preface to "Differential and Difference Equations: A Themed Issue Dedicated to Prof. Hari M. Srivastava on the Occasion of his 80th Birthday"**

It is our great pleasure to publish this book. All contents were peer-reviewed by multiple referees and published as papers in the Special Issue "Differential and Difference Equations: A Themed Issue Dedicated to Prof. Hari M. Srivastava on the Occasion of his 80th Birthday" in the journal Axioms. These studies provide new and interesting results in different branches of differential equations, so that the readers will be able to obtain the latest developments in the fields of differential equations.

> **Sotiris K. Ntouyas** *Editor*

#### *Article*
