**Meet the editor**

Hassan A. Yasser received his BSc and MSc degrees from the science college of the University of Baghdad in 1989 and 1995, respectively. He received his PhD degree from the science college of the University of Basra in 2005. He worked in the department of mathematics for seven years, in the department of computer science for six years, and in the department of physics for eleven years.

More than 70 academic papers have been published on various topics of optical communication, image processing, and mathematical physics. He has worked on four books: two books for IntechOpen *Linear Algebra, Theories and Applications* and *Fiber Optic Research*, a book entitled *Analysis of Four-Band Mixing in Optical Semiconductor Amplifiers*, and a book on *Mathematical Physics in Arabic Language*. He supervised 20 graduate students for a number of Iraqi universities.

Contents

**Preface VII**

**Section 1 Applications of Matrices 1**

Ivan I. Kyrchei

**Section 2 Spaces and Linear Systems 39**

**ODE Systems 41** Victor Martinez-Luaces

Saleem Al-Ashhab

Ab. Hamid Ganie

Chapter 3 **Square Matrices Associated to Mixing Problems**

Chapter 4 **Nullspace of Compound Magic Squares 59**

Chapter 5 **Nature of Phyllotaxy and Topology of H-matrix 75**

**and of Its Special Cases 3**

Chapter 1 **Cramer's Rules for the System of Two-Sided Matrix Equations**

Chapter 2 **Matrices Which are Discrete Versions of Linear Operations 21** Armando Martínez Pérez and Gabino Torres Vega
