Download e-book for iPad: Advanced mathematical methods for engineering and science by G. Stephenson

By G. Stephenson

ISBN-10: 0521363128

ISBN-13: 9780521363129

ISBN-10: 052136860X

ISBN-13: 9780521368605

This textbook offers a great starting place to a few vital subject matters in arithmetic of curiosity to technology and engineering scholars. incorporated are tensor algebra, usual differential equations, contour integration, Laplace and Fourier transforms, partial differential equations and the calculus of adaptations. The authors' strategy is easy and direct with an emphasis at the analytical figuring out of the cloth. The textual content is almost selfcontained, assuming simply that the scholar has a fantastic figuring out of ancillary arithmetic. every one bankruptcy encompasses a huge variety of labored examples, and concludes with difficulties for resolution, with solutions at the back of the book

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61). 95) where a prime denotes differentiation with respect to x. 95) is zero. Consequently u" V 1 ^ + 2 ^ + - = 0. 100) where A and B are arbitrary constants. 81) for /o0O we find for small x an d taking only the first two terms, Y0(x)~AJ0(x)l±(l-Jj) dx. 103) where P{x) is a polynomial in x. Hence the second solution is logarithmically divergent at x = 0. In fact, all the Yn(x) are singular at x = 0. 5. Alternative forms exist for the function Yn(x). 4- -•* 38 Special functions When v=£n, this is just a linear combination of Jv(x) and J-V(x) and so is a solution of Bessel's equation (independent of Jv(x)).

26) by letting x = sin2 0. Then, since dx = 2 sin 0 cos 0 dQ, we have J rJt/2 1 sin2"1"1 0 cos2""1 0^0. 28) V(tan 6) dd. 29) 0 Example 3 Consider J Then f-Jt/2 o rJt/2 / = f sin^ 0 cos'i 0 dd = iB(|, i). 25) with x = \. 2 The gamma-function 27 where a ^ 0, x > 0. 33) = T(jc)- f tx-lQ-ldt. 34) Finally we obtain an approximation to T(x + 1) for large x known as Stirling's formula. 3), = f feT'dt. 35) Jo We change the variable of integration from t to x, where t = x 4- rV*Then Y{x 4-1) = \ (x 4- x^x)xc-ix+ry/xWx J—V* dx.

79) for Jv. Then < 215S > <2156> which is a real function of x. 152). Iv(x) and Kv(x) are called modified Bessel functions and their properties can be obtained in a similar way to those of Jv(x) and Yv(x). The main properties of these functions are given in the next section. 157) can be solved in terms of the modified Bessel functions. 158) /0(JC) and K0(x). y(x) = Axko(x) + Bx±K0(x). 160) is y(x) =Ax%(x/2) + Bx*Kv(x/2). 163) Summary of the main properties of special functions 1. Bessel functions Bessel's equation of order v is x2 —^ + x j - + (x2 - v2)y = 0.

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Advanced mathematical methods for engineering and science students by G. Stephenson

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