William E. Boyce, Richard C. DiPrima's Elementary Differential Equations and Boundary Value PDF

By William E. Boyce, Richard C. DiPrima

ISBN-10: 0470383348

ISBN-13: 9780470383346

Written from the viewpoint of the utilized mathematician, the newest variation of this bestselling booklet makes a speciality of the speculation and useful functions of Differential Equations to engineering and the sciences. Emphasis is put on the tools of answer, research, and approximation. Use of know-how, illustrations, and challenge units support readers improve an intuitive knowing of the fabric. ancient footnotes hint the improvement of the self-discipline and determine amazing person contributions. This ebook builds the basis for a person who must research differential equations after which development to extra complicated studies.

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Additional resources for Elementary Differential Equations and Boundary Value Problems (9th Edition)

Sample text

13) The additional condition (12) that we used to determine c is an example of an initial condition. The differential equation (4) together with the initial condition (12) form an initial value problem. Now consider the more general problem consisting of the differential equation (3) dy = ay − b dt and the initial condition y(0) = y0 , (14) where y0 is an arbitrary initial value. We can solve this problem by the same method as in Example 1. If a = 0 and y = b/a, then we can rewrite Eq. (3) as dy/dt = a.

Further, the model predicts that a population above the equilibrium value will grow exponentially larger and larger. 5. If the differences between actual observations and a mathematical model’s predictions are too great, then you need to consider refining the model, making more careful observations, or perhaps both. There is almost always a tradeoff between accuracy and simplicity. Both are desirable, but a gain in one usually involves a loss in the other. However, even if a mathematical model is incomplete or somewhat inaccurate, it may nevertheless be useful in explaining qualitative features of the problem under investigation.

In general, solutions of differential equations contain one or more arbitrary constants of integration, as does the solution (16) of Eq. (15). Equation (16) represents an infinity of functions corresponding to the infinity of possible choices of the constant c. 2, if p is specified at some time t, this condition will determine a value for c; even so, we have not yet ruled out the possibility that there may be other solutions of Eq. (15) that also have the prescribed value of p at the prescribed time t.

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Elementary Differential Equations and Boundary Value Problems (9th Edition) by William E. Boyce, Richard C. DiPrima


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