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Mathematical Methods for Physics and Engineering - Matematica.NET

Mathematical Methods for Physics and Engineering - Matematica.NET

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APPLICATIONS OF COMPLEX VARIABLES10.5−10−5z−0.5Figure 25.11z.The functions Ai(z) (full line) <strong>and</strong> Bi(z) (broken line) <strong>for</strong> realThen we haveAi(0) = 12πi∫ 0∞∫ ∞= 3−2/3e −s e 4πi/3 (3s) −2/3 ds + 12πi∫ ∞e −s (−e 4πi/3 + e 2πi/3 )s −2/3 ds2πi 0√3i 3−2/3∫ ∞=e −s s −2/3 ds2πi= 3−1/62π Γ( 1 3 ),00e −s e 2πi/3 (3s) −2/3 dswhere we have used the st<strong>and</strong>ard integral defining the gamma function in the last line. ◭Finally in this subsection we should mention that the Airy functions <strong>and</strong> theirderivatives are closely related to Bessel functions of orders ± 1 3 <strong>and</strong> ± 2 3<strong>and</strong> that894

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