First Order Ordinary Differential Equations. Course book

Anita Ciekot, Izabela Zamorska

This book is designed to introduce readers to the fundamental concepts, techniques, and applications of differential equations, providing a solid foundation for further study or practical problem-solving. It is specifically intended for students of technical universities. The textbook is divided into five main chapters. In the first chapter, we will explore basic concepts and notation, establishing the language and framework necessary for understanding differential equations. Definitions and essential terminology will be clarified, accompanied by "Do it yourself" tasks to reinforce learning and ensure active engagement with the material. The subsequent chapters study specific classes of first order differential equations. Chapter 2 focuses on first order equations, including their definitions, key theorems, and special cases such as separable equations. Practical exercises are included to develop problem-solving skills. Chapter 3 covers linear differential equations, highlighting important methods such as the Euler-Lagrange approach and integrating factors. We will also examine Bernoulli equations, providing tools for solving a broad class of problems. In Chapter 4, we explore exact differential equations, discussing their properties and methods of solution. Techniques like integrating factors for nonexact equations are presented to expand your toolkit for tackling complex problems. The final chapter demonstrates the application of the theory to real-world modelling situations. We investigate how differential equations can describe phenomena in population dynamics, cooling processes, mixing, and elementary mechanics. These examples demonstrate the practical relevance of the concepts covered. An appendix on the review of integration techniques supports the main content, offering definitions, properties, tables of common integrals, and illustrative examples to strengthen your understanding. This textbook aims to make the study of differential equations accessible, engaging, and applicable to various fields.

Introduction to Mathematical Programming. Part I

Anita Ciekot

This textbook is intended for students of technical and economic universities. It is a result of my teaching of mathematical programming, optimization methods and operations research to students of Czestochowa University of Technology, including Erasmus+ Program students, for over ten years. This is the first part of a planned series (an intended series), limited to the presentation of issues related to linear programming. The second part will focus on non-linear programming problems. The textbook is divided into five main chapters. Chapter 1 is a reminder of some mathematical topics (the basics of linear algebra and systems of linear equations) that will help the readers understand the material discussed. Chapter 2 considers linear programming problems from its standard form to practical, highly common, with various examples of applications at the intersection of technology and economics. In chapter 3, the transportation problem with applications will be considered. Chapter 4 deals with a special kind of linear programing, so-called integer programming. And finally, Chapter 5 shows how the Maple package can be used to solve any linear programming problems.