Principles of differential and integral equations

From the Preface: ``The aim of this book is to offer a discussion of the fundamental concepts in the theory of differential and integral equations, with a view toward preparing the reader for graduate-level courses on advanced topics. This book can also serve a graduate-level course for non-mathematics majors. Students of various disciplines have found an increasing need to study such topics as control theory and systems theory, which are mainly based on differential equations, integral operators, and related concepts. The material included in this text will provide sufficient basis for understanding these areas of investigation. The prerequisites are a good course in advanced calculus ... some preparation in linear algebra, and a reasonable acquaintance with elementary complex analysis ... [T]he book can be used as a first course in differential and integral equations by any reader possessing knowledge of the above-mentioned fields.''