Transcription of 1 INTRODUCTION TO DIFFERENTIAL EQUATIONS
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1 INTRODUCTION TO DIFFERENTIAL EQUATIONS
11 INTRODUCTION TO and EQUATIONS as Mathematical ModelsCHAPTER 1 IN REVIEWThe words differentialandequationscertainly suggest solving some kind ofequation that contains derivatives y ,y , .. Analogous to a course in algebra andtrigonometry, in which a good amount of time is spent solving EQUATIONS such asx2 5x 4 0 for the unknown number x, in this course oneof our tasks will beto solve DIFFERENTIAL EQUATIONS such as y 2y y 0 for an unknown functiony (x).The preceding paragraph tells something, but not the complete story, about thecourse you are about to begin. As the course unfolds, you will see that there is moreto the study of DIFFERENTIAL EQUATIONS than just mastering methods that someone hasdevised to solve first things first. In order to read, study, and be conversant in a specializedsubject, you have to learn the terminology of that discipline.
highest derivative y(n) in terms of the remaining n 1 variables. The differential equation, (5) where f is a real-valued continuous function, is referred to as the normal form of (4). Thus when it suits our purposes, we shall use the normal forms to represent general first- and second-order ordinary differential equations.
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