**CHAPTER 1 First-Order ODEs****CHAPTER 2 Second-Order Linear ODEs****CHAPTER 3 Higher Order Linear ODEs****CHAPTER 4 Systems of ODEs. Phase Plane. Qualitative Methods****CHAPTER 5 Series Solutions of ODEs. Special Functions****CHAPTER 6 Laplace Transforms**

Many physical laws and relations can be expressed mathematically in the form of differential equations. Thus it is natural that this book opens with the study of differential equations and their solutions. Indeed, many engineering problems appear as differential equations.

The main objectives of Part A are twofold: the study of ordinary differential equations and their most important methods for solving them and the study of modeling.

** Ordinary differential equations (ODEs)** are differential equations that depend on a single variable. The more difficult study of partial differential equations (PDEs), that is, differential equations that depend on several variables, is covered in Part C.

** Modeling** is a crucial general process in engineering, physics, computer science, biology, medicine, environmental science, chemistry, economics, and other fields that translates a physical situation or some other observations into a “mathematical model.” Numerous examples from engineering (e.g., mixing problem), physics (e.g., Newton's law of cooling), biology (e.g., Gompertz model), chemistry (e.g., radiocarbon dating), ...

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