Download Differential Equations and Boundary Value Problems: by C. Henry Edwards, David E. Penney, David T. Calvis PDF

By C. Henry Edwards, David E. Penney, David T. Calvis

For introductory classes in Differential Equations.

 

This best-selling textual content by means of those recognized authors blends the normal algebra challenge fixing abilities with the conceptual improvement and geometric visualization of a latest differential equations path that's necessary to technology and engineering scholars. It displays the recent qualitative procedure that's changing the training of effortless differential equations, together with the broad availability of medical computing environments like Maple, Mathematica, and MATLAB. Its concentration balances the conventional handbook tools with the hot computer-based tools that remove darkness from qualitative phenomena and make available a much wider variety of extra sensible functions. Seldom-used subject matters were trimmed and new subject matters further: it starts off and ends with discussions of mathematical modeling of real-world phenomena, obvious in figures, examples, difficulties, and purposes through the text.

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Extra info for Differential Equations and Boundary Value Problems: Computing and Modeling

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Example 3 is based on the fact that a baseball moving through the air at a moderate speed v (less than about 300 ft/s) encounters air resistance that is approximately proportional to v . If the baseball is thrown straight downward from the top of a tall building or from a hovering helicopter, then it experiences both the downward acceleration of gravity and an upward acceleration of air resistance. If the y -axis is directed downward, then the ball’s velocity v D dy=dt and its gravitational acceleration g D 32 ft/s2 are both positive, while its acceleration due to air resistance is negative.

29% annually in 1999. 58 (billion) for the world population in mid-2050 (so the population will almost have doubled in the just over a half-century since 1999). 38 Chapter 1 First-Order Differential Equations (c) The world population should reach 60 billion when 60 D 6e 0:0129t I that is, when t D ln 10 0:0129 178; and thus in the year 2177. 1 billion. A simple mathematical model cannot be expected to mirror precisely the complexity of the real world. The decay constant of a radioactive isotope is often specified in terms of another empirical constant, the half-life of the isotope, because this parameter is more convenient.

Direction field and typical solution curves for the equation y 0 D 1=x . 10. 0/ D 0. x/ Á 0 (see Problem 27). 10 shows a direction field and these two different solution curves for the initial value problem in (8). x/ D 0. Example 5 illustrates the fact that, before we can speak of “the” solution of an initial value problem, we need to know that it has one and only one solution. Questions of existence and uniqueness of solutions also bear on the process of mathematical modeling. Suppose that we are studying a physical system whose behavior is completely determined by certain initial conditions, but that our proposed mathematical model involves a differential equation not having a unique solution satisfying those conditions.

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