By J. David Logan

ISBN-10: 0387299300

ISBN-13: 9780387299303

This article is designed for a standard post-calculus direction in simple differential equations. it's a short, one-semester remedy of the fundamental rules, versions, and resolution tools. The e-book, which serves instead to current texts for teachers who wish extra concise insurance, emphasizes graphical, analytical, and numerical techniques, and is written with transparent language in a effortless structure. It presents scholars with the instruments to proceed directly to the following point in utilizing differential equations to difficulties in engineering, technological know-how, and utilized mathematics.

The subject matters include:

* separable and linear first-order equations;

* self sustaining equations;

* moment order linear homogeneous and nonhomogeneous equations;

* Laplace transforms;

* linear and nonlinear platforms within the part plane.

Many workouts are supplied, as well as examples from engineering, ecology, physics, economics, and different parts. An elevated part at the required linear algebra is gifted, and an appendix includes templates of Maple and MATLAB instructions and courses that are priceless in differential equations.

**Read Online or Download A First Course in Differential Equations (Undergraduate Texts in Mathematics) PDF**

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**Extra resources for A First Course in Differential Equations (Undergraduate Texts in Mathematics)**

**Sample text**

If the decay of Carbon-14 is modeled by the DE u = −ku, where u is the amount of Carbon-14, ﬁnd the decay constant k. 000121 yr−1 ). In an artifact the percentage of the original Carbon-14 remaining at the present day was measured to be 20 percent. How old is the artifact? 10. 09 disintegrations of C14 (per minute per gram). 68 disintegrations. Estimate the date that individuals lived in the cave. 11. In the usual Malthus growth law N = rN for a population of size N , assume the growth rate is a linear function of food availability F ; that is, r = bF , where b is the conversion factor of food into newborns.

If the population returns to the state u∗ for all perturbations, no matter how large, then the state u∗ is called globally asymptotically stable. A more precise deﬁnition of local asymptotic stability can be given as follows. 12) with u(0) in I. That is, each solution starting in I converges to u∗ . Note that a semi-stable point is not asymptotically stable; such points are, in fact, not stable. 16 (Dimensionless Models) When we formulate a mathematical model we sometimes trade in the dimensioned quantities in our equations for dimensionless ones.

If T > Te then T < 0, and the temperature decreases; if T < Te then T > 0, and the temperature increases. ). 46 1. 21) using the separation of variables method introduced in the last section. Here, for variety, we illustrate another simple method that uses a change of variables. Let u = T − Te . 21) may be written u = −hu. This is the decay equation and we have memorized its general solution u = Ce−ht . Therefore T − Te = Ce−ht , or T (t) = Te + Ce−ht . 21). If we impose an initial condition T (0) = T0 , then one ﬁnds C = T0 − Te , giving T (t) = Te + (T0 − Te )e−ht .

### A First Course in Differential Equations (Undergraduate Texts in Mathematics) by J. David Logan

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