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By Swift, Randall J.; Wirkus, Stephen A

Compliment for the 1st Edition:""A path in traditional Differential Equations merits to be at the MAA's uncomplicated Library record ... the booklet with its format, is particularly pupil friendly-it is straightforward to learn and comprehend; each bankruptcy and factors movement easily and coherently ... the reviewer might suggest this ebook hugely for undergraduate introductory differential equation courses."" -Srabasti Dutta, collage of Saint Read more...

summary: compliment for the 1st Edition:""A direction in traditional Differential Equations merits to be at the MAA's uncomplicated Library record ... the ebook with its structure, is especially pupil friendly-it is simple to learn and comprehend; each bankruptcy and motives circulation easily and coherently ... the reviewer might suggest this e-book hugely for undergraduate introductory differential equation courses."" -Srabasti Dutta, university of Saint Elizabeth, MAA on-line, July 2008""An very important function is that the exposition is richly observed via desktop algebra code (equally disbursed among MATLAB, Mathematica, and Maple

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Suppose the water in the pond is well mixed so the concentration of salt at any given time is constant. To make matters worse, suppose also that at time t = 0 someone begins dumping ✐ ✐ ✐ ✐ ✐ ✐ “MAIN˙Ed2˙1p˙v02” — 2014/11/8 — 10:49 — page 40 — #53 ✐ 40 ✐ Chapter 1. Traditional First-Order Differential Equations trash into the pond at a rate of 50 m3 /day. The trash settles to the bottom of the pond, reducing the volume by 50 m3 /day. To adjust for the incoming trash, the rate that water flows out via stream C increases to 1300 m3 /day and the banks of the pond do not overflow.

If this is not true, the differential equation is not exact. 31) earlier. We see that M (x, y) = y 2 and N (x, y) = 2xy. Thus, ∂N ∂M = 2y = , ∂y ∂x so that the differential equation is exact. 32) gives M (x, y) = y and N (x, y) = 2x so that ∂M ∂N =1=2= . ∂y ∂x dy Hence y + 2x dx = 0 is not exact. Example 4 Consider the differential equation (2x sin y + y 3 ex ) + (x2 cos y + 3y 2 ex ) dy = 0. dx Here M (x, y) = 2x sin y + y 3 ex and N (x, y) = x2 cos y + 3y 2 ex ; hence ∂M ∂N = 2x cos y + 3y 2 ex = .

0007007. We note that we will have a point x > 2 that will make the denominator zero (and thus is not in the domain of our solution) and our function will become unbounded. ✐ ✐ ✐ ✐ ✐ ✐ “MAIN˙Ed2˙1p˙v02” — 2014/11/8 — 10:49 — page 14 — #27 ✐ 14 ✐ Chapter 1. Traditional First-Order Differential Equations It is sometimes the case that a substitution or other “trick” will convert the given differential equation into a form that we can solve. A differential equation of the form dy = f (ax + by + k), dx where a, b, and k are constants, is separable if b = 0; however, if b = 0 the substitution u(x) = ax + by + k makes it a separable equation.

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