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Mathematical Methods for Physics and Engineering - Matematica.NET

Mathematical Methods for Physics and Engineering - Matematica.NET

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CONTENTS5 Partial differentiation 1515.1 Definition of the partial derivative 1515.2 The total differential <strong>and</strong> total derivative 1535.3 Exact <strong>and</strong> inexact differentials 1555.4 Useful theorems of partial differentiation 1575.5 The chain rule 1575.6 Change of variables 1585.7 Taylor’s theorem <strong>for</strong> many-variable functions 1605.8 Stationary values of many-variable functions 1625.9 Stationary values under constraints 1675.10 Envelopes 1735.11 Thermodynamic relations 1765.12 Differentiation of integrals 1785.13 Exercises 1795.14 Hints <strong>and</strong> answers 1856 Multiple integrals 1876.1 Double integrals 1876.2 Triple integrals 1906.3 Applications of multiple integrals 191Areas <strong>and</strong> volumes; masses, centres of mass <strong>and</strong> centroids; Pappus’ theorems;moments of inertia; mean values of functions6.4 Change of variables in multiple integrals 199Change∫of variables in double integrals; evaluation of the integral I =∞−∞ e−x2 dx; change of variables in triple integrals; general properties ofJacobians6.5 Exercises 2076.6 Hints <strong>and</strong> answers 2117 Vector algebra 2127.1 Scalars <strong>and</strong> vectors 2127.2 Addition <strong>and</strong> subtraction of vectors 2137.3 Multiplication by a scalar 2147.4 Basis vectors <strong>and</strong> components 2177.5 Magnitude of a vector 2187.6 Multiplication of vectors 219Scalar product; vector product; scalar triple product; vector triple productvii

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