Download e-book for kindle: A First Course in Differential Equations by J. David Logan (auth.)

By J. David Logan (auth.)

The 3rd version of this concise, renowned textbook on simple differential equations provides teachers an alternative choice to the various voluminous texts out there. It offers an intensive remedy of the normal themes in an obtainable, easy-to-read, structure. The overarching standpoint of the textual content conveys that differential equations are approximately applications. This booklet illuminates the mathematical conception within the textual content with a wide selection of functions that would attract scholars in physics, engineering, the biosciences, economics and arithmetic. teachers are inclined to locate that the 1st 4 or 5 chapters are compatible for a primary direction within the subject.

This version incorporates a fit elevate over past variants within the variety of labored examples and workouts, quite these regimen in nature. appendices contain a evaluate with perform difficulties, and a MATLAB® complement that provides simple codes and instructions for fixing differential equations. MATLAB® isn't really required; scholars are inspired to make use of to be had software program to plan a lot of their suggestions. suggestions to even-numbered difficulties can be found on

From the experiences of the second one edition:

“The insurance of linear platforms within the airplane is well particular and illustrated. …Simple numerical tools are illustrated and using Maple and MATLAB is inspired. …select Dave Logan’s new and more suitable textual content for my course.”

—Robert E. O’Malley, Jr., SIAM Review, Vol. fifty three (2), 2011

“Aims to supply fabric for a one-semester direction that emphasizes the elemental principles, resolution equipment, and an creation to modeling. …The publication that effects deals a concise advent to the topic for college students of arithmetic, technology and engineering who've accomplished the introductory calculus series. …This ebook is worthy a cautious glance as a candidate textual content for the following differential equations path you teach.”

—William J. Satzer, MAA Reviews, January, 2011

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Additional info for A First Course in Differential Equations

Sample text

Write the solution, or integral curves. i) x3 + 3tx2 x = 0. iv) x3 dt + 3tx2 dx = 0. ii) t3 + v) x2 dt − t2 dx = 0. x t + (x2 + ln t)x = 0. x−x sin t iii) x = − sin t cos x+cos t . v) t(cot x)x = −2. 17. (Orthogonal trajectories) Solutions to a first-order equation form a set of integral curves of the form φ(x, y) = C, where C is a constant. ) The integral curves, for example, may be the equipotential curves of a conservative force field, such as an electric field. Every set of integral curves is defined by a differential equation φx dx + φy dy = 0, or dy/dx = −φx /φy .

The equation x + (cos t)xx = 2 is nonlinear. Clearly the equation t2 x − 4(t + 1) = 0 is linear and the normal form is 4(t + 1) . x = t2 Here, p(t) is zero. 16) are continuous. These equations occur frequently in applications. 16) is called homogeneous; the homogeneous equation is x + p(t)x = 0. Observe that the homogeneous equation is separable, and its solution is easily found to be x(t) = Ce− p(t)dt , C an arbitrary constant. 16) is called nonhomogeneous. 16) is called the source term or forcing term.

First-Order Differential Equations To resolve this problem we need a more usable version of the fundamental theorem of calculus, which is a basic result used regularly in differential equations. It provides an expression for the antiderivative of a function in terms of a definite integral with a variable upper limit. You should consult your calculus text. 12 (Fundamental Theorem of Calculus) If g(t) is a continuous function, the derivative of an integral with variable upper limit is t d dt g(s)ds = g(t), a where the lower limit a is any number.

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