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Applied Mathematics for Engineers and Physicists: Third by Prof. Louis A. Pipes, Dr. Lawrence R. Harvill

By Prof. Louis A. Pipes, Dr. Lawrence R. Harvill

Probably the most popular reference books on utilized arithmetic for a new release, allotted in a number of languages through the global, this article is aimed toward use with a one-year complex path in utilized arithmetic for engineering scholars. The remedy assumes an excellent history within the conception of complicated variables and a familiarity with advanced numbers, however it incorporates a short assessment. Chapters are as self-contained as attainable, delivering teachers flexibility in designing their very own courses.
The first 8 chapters discover the research of lumped parameter platforms. Succeeding themes contain dispensed parameter platforms and significant parts of utilized arithmetic. every one bankruptcy beneficial properties vast references for extra learn in addition to tough challenge units. solutions and tricks to pick challenge units are incorporated in an Appendix. This variation encompasses a new Preface via Dr. Lawrence R. Harvill.

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Example text

We then have where now z is held fixed in the integration and t traverses the curve c. 12) may be differentiated under the integral sign and that the result thus obtained may be differentiated in the same way. This will be assumed. Then we have From this it follows that if a function is analytic all its derivatives exist. This is not necessarily true of a function of a real variable. 7 TAYLOR’S SERIES The Taylor’s series expansion of a function of a real variable should be quite familiar to those who have had only a slight background in differential calculus.

2) reduces to where c is a closed curve lying in the xy plane and s is the surface bounded by this curve. 4) into surface integrals. 4) vanishes. Using Eq. 16), this integral may be shown to vanish also. 1) is proved. Fig. 1 As a consequence of this theorem it follows that the path of the line integral, whether closed or between fixed limits, may be deformed without changing the value of the integral, provided that in the deformation no point is encountered at which w(z) ceases to be analytic. MULTIPLY CONNECTED REGIONS Cauchy’s integral theorem has been deduced under the assumption that the closed curve is the boundary of a simply connected region.

3), it becomes where the integration is performed in a positive sense about a small circle whose center is at the origin. It follows that, if has a definite value, then that value is the residue of w(z) at infinity. For example, the function behaves like 1/z for large values of z and is therefore analytic at z= ∞. However, Hence the residue of w(z) at infinity is –1. We thus see that a function may be analytic at infinity and still have a residue there. 12 EVALUATION OF RESIDUES The calculation of the residues of a function w(z) at its poles may be performed in several ways.

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