**About the Editor**

**Snezhana Hristova** (Professor, PhD, DSc) is a Professor of Mathematics at University of Plovdiv "Paisii Hilendarski", Bulgaria. Her research interests are mainly in the field of differential equations and more precisely in functional differential equations, impulsive differential equations, fractional differential equations, and difference equations, as well as their applications. She is an author of 10 books (including one published by Springer) and more than 150 scientific papers (including ISI/Web of Science articles). She has an h-index of 17 (according to Scopus). Prof. Hristova is a Member of the Editorial Board of more than 10 journals (including journals indexed by ISI/Web of Science).

## **Preface to "Recent Investigations of Differential and Fractional Equations and Inclusions"**

During the past decades, the subject of calculus of integrals and derivatives of any arbitrary real or complex order has gained considerable popularity and impact. This is mainly due to its demonstrated applications in numerous seemingly diverse and widespread fields of science and engineering. In connection with this, grea<sup>t</sup> importance is attached to the publication of results that focus on recent and novel developments in the theory of any types of differential and fractional differential equation and inclusions, especially covering analytical and numerical research for such kinds of equations.

This book is a compilation of articles from a Special Issue of Mathematics devoted to the topic of "Recent Investigations of Differential and Fractional Equations and Inclusions". It contains some theoretical works and approximate methods in fractional differential equations and inclusions as well as fuzzy integrodifferential equations. Many of the papers were supported by the Bulgarian National Science Fund under Project KP-06-N32/7.

Overall, the volume is an excellent witness of the relevance of the theory of fractional differential equations.

> **Snezhana Hristova** *Editor*
